Good morning, we use GemBox.Email to validate an email address and it works fine, but in ONLY 1 case there we get a ServerFailure.
The problem is the EHLO command sent by GemBox.Email: IP literal
Server IP is 217.194.8.28
220 in-3.smtp.seeweb.it ESMTP Postfix (Debian/GNU) (Seeweb)
EHLO [195.190.xxx.xxx]
250-in-3.smtp.seeweb.it
250-PIPELINING
250-SIZE 102400000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
MAIL FROM:validate@gemboxsoftware.com
250 2.1.0 Ok
RCPT TO:info@reginacarmeli.it
554 5.7.1 <[195.190.21.101]>: Helo command rejected: IP literal in HELO hostname - please contact postmaster@seeweb.it
There is a way to send custom “EHLO”?
And should be wonderfull if we can customize also the “MAIL FROM”
It was not simple to debug this ServerError, because we cannot see or log the server comunication.
We have manual reproduced the session and we found the error, there is a debug mode or a way to log the server comunication?
Best Regards
Staff IDS