> From: Ian Zimmerman
> An unwanted message arrived to my mailbox with the following Subject:
>
> Subject: =?UTF-8?B?VXMgY29uZ3Jlc3MgaGVhcmluZyBvZiBtYWFuIGFsc2FhbiBNb25leSBsYXVuZHJ5INmC?=
> =?UTF-8?B?2LbZitipINin2YTZg9mI2YbYutis2LHYsyDZhNi62LPZitmEINin2YTYo9mF2YjYp9mEINmE2YTZhdmE?=
> =?UTF-8?B?2YrYp9iv2YrYsSDZhdi52YYg2KfZhNi12KfZhti5?=
>
> Try decoding it yourself if you dare ;-)
> What else could it stop from working?
In the beginning of Exim config:
check_rfc2047_length = false