server dropped connection without sending the initial greeting

I am running postfix server. One of my users is trying to send an email to and postfix is droping the connection. I cant figure this one out, why am I getting this error:
Apr  3 05:05:13 mail1 postfix/smtp[12542]: 81A218CA83: to=<******.******>, relay=none, delay=306603, status=deferred (connect to[]: server dropped connection without sending the initial greeting)

I confirmed that mail was going to the right location
nslookup -q=MX     internet address =

The funny thing is that it takes a good 5-8 seconds for the initial greeting from email server when I
"telnet 25"

I do have "smtpd_helo_required = yes" in my
Could smtp_helo_timeout be the trick?
Who is Participating?
Yes, that sounds reasonable. You may also want to try smtp_connect_timeout parameter as well.

If you wanted to you could also setup a special transport table just for these types of difficult sites (such as Hotmail as well), assigning them to a special delivery agent that applies special timeout settings just for them.

DMS-XAuthor Commented:
Looking at both of these settings they are already set to a reasonable timeout.
smtp_helo_timeout = 300s
smtp_connect_timeout = 30s
I changed smtp_connect_timeout to 300s
I will let you know if this worked.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.