smtp_address_cmp does not ignore case of localpart

[Andreas Jobs]

Hi,

in src/lib-smtp/smtp-address.c line 759 the localpart is compared with 
null_strcmp, which does not ignore the case. While this is the correct 
behavior (according to the RFC) it causes problems in real life.

In my case the vacation notices are not sent, if someone writes to 
First.Last at ruhr-uni-bochum.de because :addresses contains (only)
first.last at ruhr-uni-bochum.de.



Regards,
Andreas

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