Error Code, Status Code, Error Text ; 450, 4.2.1, The user you are trying to contact is receiving email too quickly. Please resend your message at a later time. If the user is able to receive email at that time, your message will be delivered. For more information, go to ; 450, 4.2.1, The user you are trying to contact is receiving email at a rate that prevents additional messages from being delivered. Please resend your message at a later time. If the user is able to receive email at that time, your message will be delivered. For more information, go to ; 450, 4.2.1, Peak SMTP relay limit exceeded for this customer. This is a temporary error. For more information on SMTP relay limits, contact your administrator or go to ; 452, 4.2.2, The recipient's inbox is out of storage space. Please direct the recipient to ; 451, 4.3.0, Email server has temporarily rejected this message. Go to About SMTP error messages ; 451, 4.3.0, Multiple destination domains per transaction is unsupported. Please try again. For more information, go to ; 421, 4.3.0, Temporary System Problem. Try again later. For more information, go to About SMTP error messages ; 451, 4.4.2, Timeout - closing connection. For more information, go to About SMTP error messages ; 421, 4.4.5, Server busy, try again later. For more information, go to About SMTP error messages ; 451, 4.5.0, SMTP protocol violation. For more information, go to About SMTP error messages ; 452, 4.5.3, Domain policy size per transaction exceeded, please try this recipient in a separate transaction. For more information, go to ; 452, 4.5.3, Your message has too many recipients. For more information regarding Google's sending limits, go to ; 421, 4.7.0, Connection expired, try reconnecting. For more information, go to About SMTP error messages ; 421, 4.7.0, IP not in whitelist for RCPT domain, closing connection. For more information, go to ; 421, 4.7.0, Try again later, closing connection. ( command ) For more information, go to About SMTP error messages ; 421, 4.7.0, The IP address sending this message does not have a PTR record, or the corresponding forward DNS entry does not point to the sending IP. To protect our users from spam, email sent from your IP address has been temporarily rate limited. For more information, go to ; 454, 4.7.0, Too many login attempts, please try again later. For more information, go to Add Gmail to another email client ; 454, 4.7.0, Cannot authenticate due to a temporary system problem. Try again later. For more information, go to ; 421, 4.7.0, TLS required for RCPT domain, closing connection. For more information, go to ; 421, 4.7.0, This message is suspicious due to the very low reputation of the sending IP address. To protect our users from spam, email sent from your IP address has been temporarily rate limited. For more information, go to ; 421, 4.7.0, This message is suspicious due to the very low reputation of the sending domain. To best protect our users from spam, the message has been blocked. For more information, go to ; 421, 4.7.0, This message is suspicious due to the nature of the content or the links within. To best protect our users from spam, the message has been blocked. For more information, go to ; 451, 4.7.23, ip-address The sending IP address for this message doesn’t have a PTR record, or the PTR record’s forward DNS entry doesn’t match the sending IP address. To protect users from spam, your email has been temporarily rate limited. ; 451, 4.7.24, The SPF record of the sending domain has one or more suspicious entries. To protect our users from spam, email sent from your IP address has been temporarily rate limited. For more information, go to ; 451, 4.7.26, Unauthenticated email from domain-name is not accepted due to domain's DMARC policy, but temporary DNS failures prevent authentication. Please contact the administrator of ; 421, 4.7.26, This email has been rate limited because it is unauthenticated. Gmail requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = did not pass SPF ; 421, 4.7.27, Your email has been rate limited because SPF authentication didn't pass for this message. Gmail requires all bulk email senders to authenticate their email with SPF. Authentication results: SPF ; 421, 4.7.28, Gmail has detected an unusual rate of email. To protect our users from spam, email has been temporarily rate limited. To review our bulk email senders guidelines, go to ; 421, 4.7.28, . To protect our users from spam, email sent from your IP address has been temporarily rate limited. To review our bulk email senders guidelines, go to ; 421, 4.7.28, ip-address . To protect our users from spam, email sent from your IP Netblock has been temporarily rate limited. To review our bulk email senders guidelines, go to ; 421, 4.7.28, domain-name . To protect our users from spam, email sent from your domain has been temporarily rate limited. To review our bulk email senders guidelines, go to ; 421, 4.7.28, Gmail has detected an unusual rate of unsolicited email containing one of your URL domains. To protect our users from spam, email with the URL has been temporarily rate limited. To review our bulk email senders guidelines, go to ; 421, 4.7.28, Gmail has detected an unusual amount of unsolicited email originating from your IP address. To protect our users from spam, email sent from your IP address has been temporarily blocked. To review our bulk email senders guidelines, go to ; 421, 4.7.28, Gmail has detected this sender exceeded the quota for sending messages that have the same Message-ID:. To best protect our users, the message has been temporarily rejected. For more information, go to ; 421, 4.7.29, Your email has been rate limited because this message wasn’t sent over a TLS connection. Gmail requires all bulk email senders to use TLS/SSL for SMTP connections. ; 421, 4.7.30, Your email has been rate limited because DKIM authentication didn't pass for this message. Gmail requires all email bulk senders to authenticate their email with DKIM. Authentication results: DKIM = Did not pass. ; 421, 4.7.32, Your email has been rate limited because the From: header (RFC5322) in this message isn’t aligned with either the authenticated SPF or DKIM organizational domain. ; 550, 5.1.1, The email account that you tried to reach does not exist. Please double-check the recipient's email address for typos or unnecessary spaces. For more information, go to ; 553, 5.1.2, We weren't able to find the recipient domain. Please check for any spelling errors and make sure you didn't enter any spaces, periods, or other punctuation after the recipient's email address. For more information, go to ; 553, 5.1.3, The recipient address address is not a valid RFC 5321 address. For more information, go to ; 553, 5.1.7, The sender address address is not a valid RFC 5321 address. For more information, go to ; 550, 5.2.1, The email account that you tried to reach is inactive. For more information, go to https://support.google.com/mail/?p=DisabledUser ; 550, 5.2.1, The user you are trying to contact is receiving email at a rate that prevents additional messages from being delivered. For more information, go to ; 552, 5.2.2, The recipient's inbox is out of storage space and inactive. Please direct the recipient to ; 552, 5.3.4, Your message exceeded Google's message size limits. To view our message size guidelines, go to ; 552, 5.3.4, attachments. To view our attachment size guidelines, go to Gmail receiving limits in Google Workspace ; 552, 5.3.4, limit bytes. To view our message size guidelines, go to Gmail receiving limits in Google Workspace ; 552, 5.3.4, Your message exceeded Google's message header size limits. To view our header size guidelines, go to ; 552, 5.3.4, limit total header bytes or limit header fields. To view our header size guidelines, go to ; 552, 5.3.4, limit bytes per individual header size. To view our header size guidelines, go to ; 552, 5.3.4, bytes per individual header size. To view our header size guidelines, go to Gmail message header limits ; 552, 5.3.4, limit bytes. To view our header size guidelines, go to Gmail message header limits . ; 552, 5.3.4, Your message has a Subject: header that exceeds Google's message header size limits. To view our header size guidelines, go to ; 550, 5.4.5, Daily user sending limit exceeded. For more information on Gmail sending limits, go to ; 550, 5.4.5, Daily SMTP relay limit exceeded for user. For more information on SMTP relay sending limits, contact your administrator or go to ; 554, 5.4.6, Message exceeded 50 hops, this may indicate an email loop. For more information, go to ; 503, 5.5.1, Bad sequence of commands. For more information, go to About SMTP error messages ; 502, 5.5.1, Unimplemented command. For more information, go to About SMTP error messages ; 502, 5.5.1, Unrecognized command. For more information, go to About SMTP error messages ; 502, 5.5.1, Too many unrecognized commands, goodbye. For more information, go to About SMTP error messages ; 503, 5.5.1, No DATA after BDAT. An email transaction protocol command was issued out of sequence. For more information, go to ; 503, 5.5.1, EHLO/HELO first. An email transaction protocol command was issued out of sequence. For more information, go to ; 503, 5.5.1, An email transaction protocol command was issued out of sequence. For more information, go to ; 503, 5.5.1, RCPT first. An email transaction protocol command was issued out of sequence. For more information, go to ; 501, 5.5.2, Syntax error, cannot decode response. For more information, go to About SMTP error messages ; 555, 5.5.2, Syntax error. For more information, go to About SMTP error messages and review RFC 5321 specifications. ; 555, 5.5.2, Syntax error, goodbye. For more information, go to About SMTP error messages ; 550, 5.5.3, Too many recipients for this sender. For more information, go to About SMTP error messages ; 501, 5.5.4, HELO/EHLO argument argument invalid closing connection. For more information, go to ; 501, 5.5.4, Empty HELO/EHLO argument not allowed, closing connection. For more information, go to ; 554, 5.6.0, Email message is malformed. Not accepted. For more information, go to Email sender guidelines ; 552, 5.7.0, This message was blocked because its content presents a potential security issue. To review our message content and attachment content guidelines, go to ; 503, 5.7.0, No identity changes permitted. For more information, go to About SMTP error messages ; 550, 5.7.0, domain-name (as obtained from HELO and (E)MAIL FROM). Email is being sent from a domain or IP address which isn't registered in your Workspace account. Please login to your Workspace account and verify that your sending device IP address has been registered within the Workspace SMTP Relay Settings. For more information, go to ; 550, 5.7.0, Email relay denied ip-address . The sending email account has been temporarily suspended due to abuse. For more information, go to ; 550, 5.7.0, Email sending denied. For more information, go to SMTP relay service error messages ; 554, 5.7.0, Too many unauthenticated commands. For more information, go to About SMTP error messages ; 530, 5.7.0, Authentication required. For more information, go to Can't sign in to your Google Account ; 530, 5.7.0, Must issue a STARTTLS command first. For more information, go to About SMTP error messages ; 552, 5.7.0, This message was blocked because its content presents a potential security issue. To review our message and attachment content guidelines, go to ; 550, 5.7.1, The user or domain that you are sending to (or from) has a policy that prohibits the email that you sent. Contact your domain administrator for assistance. For more information, go to ; 550, 5.7.1, Invalid credentials for relay ip-address . The IP address you've registered in your Workspace SMTP Relay service doesn't match the domain of the account this email is being sent from. If you are trying to relay email from a domain that isn't registered under your Workspace account or has empty envelope-from:, you must configure your email server either to use SMTP AUTH to identify the sending domain or to present one of your domain names in the HELO or EHLO command. For more information, go to ; 550, 5.7.1, This message is likely unsolicited email. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to ; 550, 5.7.1, This message does not meet IPv6 sending guidelines regarding PTR records and authentication. For more information, go to ; 550, 5.7.1, This message is likely suspicious due to the very low reputation of the sending IP address. To best protect our users from spam, the message has been blocked. For more information, go to ; 550, 5.7.1, This message is likely suspicious due to the very low reputation of the sending domain. To best protect our users from spam, the message has been blocked. For more information, go to ; 550, 5.7.1, Messages missing a valid address in the From: header, or having no From: header, are not accepted. For more information, go to ; 550, 5.7.1, Messages missing a valid Message-ID: header are not accepted. For more information, go to ; 550, 5.7.1, Messages with multiple addresses in the From: header are not accepted. For more information, go to ; 550, 5.7.1, The message contains a unicode character in a disallowed header. To review our message and header content guidelines, go to ; 550, 5.7.1, This message is not RFC 5322 compliant because it has duplicate headers. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to ; 550, 5.7.1, This message is not RFC 5322 compliant because the From: header is missing. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to ; 550, 5.7.1, This message is not RFC 5322 compliant because it has multiple From: headers. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to ; 550, 5.7.1, This message is not RFC 5322 compliant because the From: header has a non-compliant domain name. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to ; 550, 5.7.1, This email has been rate limited. For more information, go to Limits for sending & getting email ; 550, 5.7.1, The IP you're using to send email is not authorized to send email directly to our servers. Use the SMTP relay at your service provider instead. For more information, go to ; 550, 5.7.1, Daily SMTP relay sending limit exceeded for this customer. For more information on SMTP relay sending limits, contact your administrator or visit ; 550, 5.7.1, Encoded-word syntax is not permitted in message header header-name . To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to ; 550, 5.7.1, headers. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to
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