Please help me add to these. If you have more add a comment and I’ll extend the list. Thanks.
ERROR : “Remote host said: 476 – connection from your host are denied “
REASON : If sending client originates too many requests of the server in too short a time this will result in a lockout of that account for a period of time. I have seen this happen when I open a huge IMAP account on a new machine. You can either adjust one or more of the parameters or whitelist the IP Address.
ERROR : “Remote host said: 550 Requested action not taken: mailbox unavailable Giving up on “
REASON : If sending address is invalid,then you will get this message
ERROR : Sorry, I couldn’t find any host named
REASON : Problem with the recipient domain. i.e , The domain name specified is unknown. Either you typed it incorrectly or that domain no longer exists.
ERROR : “Remote host said: 550 abc [at] example [dot] com: Recipient address rejected:” unknown user
REASON : The email address specified by you was incorrect. kindly check the recipient email address.
ERROR : Remote host said: 554 Message type not allowed. UP Email not accepted for policy reasons
REASON : Please add SPF records for your DNS and send the mail.
ERROR : Remote host said:553: Relay access denied
REASON : This error means that the person sending the email was not authorized to use the email server (SMTP) server. In your email-client please enable this option —> my server requires Authentication(In out going server settings)
ERROR : Remote host said 554: Sender address rejected: Access denied
REASON :This error means that the sender address is blacklisted in one of the spam filter lists .
ERROR : 554 #5.5.4 Relaying denied. IP name lookup failed for
REASON : Your IP address does not have a reverse DNS record.
ERROR :Remote host said: 553 sorry, that domain isn’t in my list of allowed rcpthosts
REASON :This error means that the local user ( who is allowed to send mails locally, not to outside domains) is sending mail to the outside world.
ERROR : “Sorry, no mailbox here by that name”
REASON : This is due to invalid email address.please check the email-address and try again.
ERROR : Connected to but greeting failed
REASON : This sometimes occurs when your servers Ip is blacklisted.
ERROR : Connected to but connection died. (#4.4.2) I’m not going to try again; this message has been in the queue too long.
REASON : Recipient server was facing some problem at that time.try to resend the mail again.
ERROR :This message is looping: it already has my Delivered-To line
REASON : problem with the aliases.please check the aliases
ERROR : Sorry, I wasn’t able to establish an SMTP connection. (#4.4.1) I’m not going to try again; this message has been in the queue too long
REASON : If the recipient domain does not have valid mx record, you will get this error.so please contact them and get it rectified.
ERROR : Connected to 192.121.XX.XXX but authentication was rejected (password).“Remote host said: 535 authorization failed”
REASON : This is due to wrong password.please check the password.
ERROR :user [at] example [dot] com:qmail-group: fatal: get ldap group entry: no such object I’m not going to try again; this message has been in the queue too long
ERROR : Sorry, firstname.lastname@example.org is over their allocated Quota
REASON : The recipient’s mailbox is full. Contact them to delete some emails.
ERROR : Remote host said:552 sorry, that message size exceeds my databytes limit
REASON : The size of the attachment is too large.please try to reduce the size of attachment and try to send the mail.
ERROR : Connected to 45.54.XXX.XXX but sender was rejected. Remote host said: 550 Your e-mail was rejected for policy reasons on this gateway. Reasons for rejection may be related to content such as obscene language, graphics, or spam-like characteristics (or) other reputation problems. For sender troubleshooting information, please go to http://postmaster.msn.com. Please note: if you are an end-user please contact your E-mail/Internet Service Provider for assistance.
REASON : Please add SPF record for your DNS.This will solve the problem.
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