SMTP RCPT error

I get bounce back message "Grammar error reported for RCPT command: Error Command Code 501 was encountered waiting for a RCPT response (501  #5.5.2 syntax error 'RCPT TO:"

In the log there is this command: RCPT TO: <user@domain.com>

From what I've read really quick there shouldn't be a space, it should look like this:

RCPT TO:<user@domain.com>

Does this mean that my mail server is adding the space and the receiving server is rejecting it then?  Is there any way I can fix this?  We are using ISMail EP
LVL 8
sharkbot221984Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

kevin_uCommented:
A space there is normally not a problem.  Maybe something else is in there?  tab?  maybe a trailing space (i remember a mail server that had a bug in it when there was a trailing space).  I'd call support for ISMail.  It may simply be a problem with the destination server.  You may want to contact them as well.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sharkbot221984Author Commented:
ISMail is defunct no support there.  I agree the extra space shouldn't be a problem.  I did send 2 more messages and the mail logs show that the destination server gave 250 OK for the RCPT command on those, no bounce back (yet).  I did a tracert to the destination domain and it timed out at their ISP I think.  Not sure that there is anything else to be done, other emails are flowing in/out normally.
0
sharkbot221984Author Commented:
The extra space is always present in the log files and other servers receive our mail fine.  The extra space I doubt is the issue.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Email Protocols

From novice to tech pro — start learning today.