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December 17, 2007

SMTP 553-Relaying Denied

(We are using ChilkatMail2.dll.)
We have an end client trying to send emails/text messages and receiving error:
553-Relaying denied.
We are assuming that their STMP server should have Relaying turned on. Is this a correct assumption?

Is there a way around this? Some STMP server providers don’t want to turn this feature on.

Usually the solution is to authenticate by setting the mailman.SmtpUsername and mailman.SmtpPassword properties prior to calling SendEmail. Many SMTP servers will allow non-relayed email to be sent w/out authentication, but require authentication when sending to external domains.

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