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A signature is not applied to emails with large attachments

Problem

You have configured Signature 365 to apply signatures server-side but a signature is not applied to emails with large attachments.

Reason

To ensure efficient processing of email, a limit is imposed on the size of email to which Signature 365 will add a signature server-side.

Information

The maximum email size accepted by the Signature 365 service for server-side signatures is 30MB.

The underlying encoding of emails during transport can increase the size of an email by up to 30%, so a 24MB email (at the time of sending) may have an actual size of 30MB during transport.

Solution

Deploy the Signature 365 add-in for Outlook to apply signatures client-side and use Outlook for Windows or Outlook on the Web to send emails with large attachments.