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SMTP RCPT error

Posted on 2009-07-16
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Last Modified: 2013-11-30
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
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Question by:sharkbot221984
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kevin_u earned 500 total points
ID: 24875626
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.
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by:sharkbot221984
ID: 24883460
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.
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Author Closing Comment

by:sharkbot221984
ID: 31604392
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.
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