I know this is minor, just bringing it to light if Wietse feels it is worth doing something about. I noticed on emails with encoded subject lines an extra character is being inserted into the logs.
EMAIL HEADER Subject: =?UTF-8?B?8J+YsSBTSE9QIE5PVzogR2V0IDAlIElOVEVSRVNUIERlYWxzIHBs?= =?UTF-8?B?dXMgZXhjbHVzaXZlIHZvdWNoZXJzIHdpdGggU1BheUxhdGVyISDwn5GJ?= LOGS Aug 25 01:06:58 hostname postfix/cleanup[3106]: 4MCrYG4Y4Zz7VvCt: info: header Subject: =?UTF-8?B?8J+YsSBTSE9QIE5PVzogR2V0IDAlIElOVEVSRVNUIERlYWxzIHBs?=? =?UTF-8?B?dXMgZXhjbHVzaXZlIHZvdWNoZXJzIHdpdGggU1BheUxhdGVyISDwn5GJ?= from example.com[xxx.xxx.xxx.xxx]; from=<bounce-17_html-377469875-141153-100020371...@example.com> to=<u...@example.com> proto=ESMTP helo=<example.com> SIDE BY SIDE COMPARE =?UTF-8?B?8J+YsSBTSE9QIE5PVzogR2V0IDAlIElOVEVSRVNUIERlYWxzIHBs?= =?UTF-8?B?dXMgZXhjbHVzaXZlIHZvdWNoZXJzIHdpdGggU1BheUxhdGVyISDwn5GJ?= =?UTF-8?B?8J+YsSBTSE9QIE5PVzogR2V0IDAlIElOVEVSRVNUIERlYWxzIHBs?=? =?UTF-8?B?dXMgZXhjbHVzaXZlIHZvdWNoZXJzIHdpdGggU1BheUxhdGVyISDwn5GJ?= There is an extra '?' in the logs for the header which places that '?' in the middle of the subject after its been decoded using PHP iconv_mime_decode().
