mail.domain.org #5.5.0 smtp;553 #5.1.8 Domain of sender address does not exist. SendMail Error Message: 553 5.1.8 ⦠Domain of sender address ⦠Russia, Vietnam and China are favourites for that treatment. Domain of sender address ... does not exist case 004 ruleset=check_mail reject=553 5.1.8. LinuxQuestions.org - [SOLVED] Domain of sender address does ⦠Aug 22, 2008 3:18PM. Anyway, did you try to send an email to user@localhost and see what happens. POSTFIX+SENDMAIL+RELAY+Domain ... does not exist I am not a plusnet customer myself, but this issue has me concerned enough for my customers as they are not receiving any order emails, and I have no other means to contact them which comply with GDPR. Re: Sendmail: Domain of sender address does not exist Domain of sender address address@domain1.com does not exist" I was using masquarade_domain in the sendmail.cf to change mydomain to ent_domain since the smtp server resides on ent_domain. server administrator to find out why your server doesn't think it's valid. Example: Error sending emails: Domain of sender address does not ⦠Check /etc/postfix/main.cf, there are a few ways this can be specified, this may help: http://www.postfix.org/BASIC_CONFIGURATION_README.html#myorigin The real domain name is lankheet.com It both resolves to an MX and A record. If Barracuda could not resolve the recipient address, and fail to send, have you contacted Barracuda for further assistance as we have not such scenario? smtp;553 #5.1.8 Domain of sender address does not exsist This document describes license packages, bundles, optional subscriptions and add-ons, and licensing for Virtual Appliances. It is this Return-path that appears to cause SOME mailservers fits. 421 4.1.8 - ERROR: Domain of sender address EMAIL_ADDRESS_GOES_HERE does not resolve 554 5.1.8 - ERROR: Domain of sender address EMAIL_ADDRESS_GOES_HERE does not exist Road Runner requires that the sender of every email inbound to its systems be from a domain which exists in the DNS.