Exim and invalid ‘EHLO’ chars

We had some mac users complaining that they couldn’t send mail via our exim smtp server. Exim logged stuff like ‘

rejected EHLO from []: syntactically invalid argument(s): test\.no

To work around telling the end user to use an other email client, or tell Apple to fix their mail client I ended up using the directive

helo_allow_chars = '\'

in exim.conf instead.

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