SMTP authentication not possible since CW 3.29
SMTP authentication (cf. #221) has been added to CW 3.30 and backported to 3.26 but was lost when merging 3.28.3 with 3.29 (1a6c58a9fcef). Projects using CW3.29 can no longer send e-mails through authenticated SMTP server.
There might be other bugfixes which didn't get in during this merge. Find which patches didn't get in and re-add them.in 3.29 and newer.