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Why does an Equal Sign (=) show up at the end of attachments when using LOTUS/DOMINO for outbound mail?

  • Type: Knowledgebase
  • Date changed: one year ago
Solution #00006134

Scope:
Email Security Gateway, all firmware versions in combination with LOTUS/DOMINO


Answer:

Q: Why does an Equal Sign (=) show up at the end of attachments when using LOTUS/DOMINO for outbound mail

A: Domino has an issue with including an extra = that causes problems with a number of other products, including Exchange and Thunderbird. The MIME library Barracuda uses does not decode the final '=' in the body of the MIME part so it interprets it as a literal equal sign (=)


This is a problem when the attachment is encoded as 'Content-Transfer-Encoding: quoted-printable'


The '=' at the end of a line is normally interpreted as a soft carriage return, which means to append the next line. This works fine in all cases except for the last '=' which does not have a line following it. The MIME library we use attempts to append the next line, but because there is nothing to append it interprets it as an (=).


To prevent this we recommend you use the default encoding of Base 64. Here are some additional links where using Quoted Text with Domino can lead to problems:


In Exchange:



In Thunderbird:



Here's a description of how to change the setting in Domino: