Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Sendmail fails to send to one domain

Sendmail fails to send to one domain

Sendmail fails to send to one domain

Sendmail version 8.13.8 running on Redhat

We have a single domain we cannot send any mail to anymore.
The beginning of the year we had no issues. There hasn't been a change to our network. The domain has two IPs for their mail server. When I try to flush that deferred message, it attempts to send in the proper priority but it states it timed out with both IPs.
Last night we SSH'd into our sendmail server, brought up a terminal and was able to telnet over port 25 into their mail server and send them a message that way.
We did packet capture last night and never saw the MTA try and deliver email to that domain. We saw it deliver when we did it over telnet and saw it delivering normally to other addresses outside of that domain.

I looked in every place I could think of. There is nothing I can find that points to their domain or that IP.
I don't see why the MTA doesn't actually send out the message.


RE: Sendmail fails to send to one domain

is sendmail started?  can you tail the mail log?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close