https://bugs.exim.org/show_bug.cgi?id=2193

            Bug ID: 2193
           Summary: SRS can create hashes that create invalid MAIL
                    FROM:-adresses
           Product: Exim
           Version: 4.89
          Hardware: Other
                OS: FreeBSD
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Experimental
          Assignee: ni...@exim.org
          Reporter: ni...@kobschaetzki.net
                CC: exim-dev@exim.org

The SRS-part of exim uses an old library that includes two base64-tables. One
of those tables has a period as part of it. Therefore it can happen in rare
cases that an SRS-address is created that includes two periods directly one
after another. This is then an e-mail-address that doesn't conform to RFC 5321
(see also RFC 3696) and therefore those mails then get denied by various
mail-servers like those from googlemail.
A user can get then those mails only out after exim creates a new base64-hash
(which appears to happen once a day) for the senders address.

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