FortiMail
FortiMail provides advanced, multi-layer protection against the full spectrum of email-borne threats
goliver
Staff
Staff
Article Id 197742
Description

This article provides a verification check to make if there is a problem sending a large file through a FortiMail.  The error that is reported is : DSN: to <joedoe@acme.com>; reason: Service unavailable; sessionid:


Scope

FortiMail


Solution
A possible cause is that the email has exceeded the domain and session limits after having been encoded with a base64 encoder for the email transport.  For example, an email that contains a file of 10MB will be much greater in size after it has been encoded.

Check the History Log of the FortiMail as this will report the size of the actual email.

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