Mail Delivery Problem

[plan9]

Last week I had a user receive the following two messages:

lost connection with host.domain.com [x.x.x.x] while sending message body

- and -

connect to host.domain.com [x.x.x.x]: server dropped connection without sending the initial SMTP greeting

Both of these bounces came from the same destination. My user had a couple of moderately sized attachments on each message (about 1 MB each).

I would have thought it if was a problem with the attachment size I'd see a different message.

[uxbod]

Depends on how the remote server has configured their MTA. It may also be not the size but the file extension that is being blocked.

[plan9]

That thought had crossed my mind as well. The attachments in question were PDF files, so I assumed that they wouldn't be blocked.

Does it sound like an issue on the destination side then?

[uxbod]

Well if it is when one of your users is sending to someone else outside of your company then I would say yes, and the message

lost connection with host.domain.com [x.x.x.x] while sending message body

would appear to back that up. If you telnet to that host on port 25 can you send a email through manually ?

[plan9]

When I attempt to send a message via telnet, I receive the following error:

501 5.1.8 bad address syntax

I've tested sending to recipients at other domains this way and it works just fine.

[uxbod]

it will depend on what checks they have in place. for the sender/recipient try something like

from: <itsme@domain.com>

[plan9]

I continue to get the "501 5.1.8 bad address syntax" error when I enter the MAIL FROM:user@domain.com.

I've had no problem sending messages elsewhere. I'm just not sure if its a misconfiguration at the destination or some check they're doing that others aren't.