Skip to main content

Unroutable address

jwhitesell
I've run into an email deliverability issue I've never seen before. When trying to send mail from an account the mail is rejected by the remote server with the following messages: SMTP error from remote mail server after MAIL FROM: SIZE=61649: 550-Verification failed for 550-Unrouteable address 550 Invalid sender I've got SPF and DKIM set up correctly. All deliverability tests I run find no issues. The recipient's provider said this to their client: "They have disabled "Allow empty sender address" in the SMTP/AntiSpam settings. This setting is enabled by default. " I've looked through the EXIM settings and if there is a setting like that I've missed it. Any insight into how to solve this? Thanks!

Comments

2 comments

Date Votes
  • jwhitesell
    And to expand on this... the address on my server that is being rejected by the remote server IS set up correctly on my server and has no issues with any other external addresses except those hosted by this one provider. What could cause this valid address on my server to fail an SMTP callout verification? It appears to succeed when I try it.
    I've run into an email deliverability issue I've never seen before. When trying to send mail from an account the mail is rejected by the remote server with the following messages: SMTP error from remote mail server after MAIL FROM: SIZE=61649: 550-Verification failed for 550-Unrouteable address 550 Invalid sender I've got SPF and DKIM set up correctly. All deliverability tests I run find no issues. The recipient's provider said this to their client: "They have disabled "Allow empty sender address" in the SMTP/AntiSpam settings. This setting is enabled by default. " I've looked through the EXIM settings and if there is a setting like that I've missed it. Any insight into how to solve this? Thanks!

    0
  • cPanelLauren
    Hello @jwhitesell This isn't an exim setting which is why you're not finding it. This is a setting that is specific to the recipient's Anti-SPAM configuration. While more than likely the issue is a sender verification lookup failed due to some configuration issue on the remote server, Per RFC requirements Empty senders must be allowed. This is noted in exim's documentation RFC 1123 - Requirements for Internet Hosts - Application and Support of the RFC documentation. This is an issue that needs to be addressed on the remote server, it cannot be addressed on your server. Thanks!
    0

Please sign in to leave a comment.

Didn't find what you were looking for?

New post