I have a problem sending emails with 600kb attachment to one sight.
Emails with smaller attachments get there.
The error message I get is:

conversation with mail.mullen.com[208.12.118.16] timed out while
sending message body)


I am able to send and recieve emails with 600KB to yahoo.com. Why
would it be a problem sending to mullen.com?


I read postings and they mentioned that by lowering the MTU that might
, but I am to send emails to yahoo. Is Yahoo system configuration
able to handle my emails, but not mullen.com?
Thank you