A couple of days ago I began regularly receive some error when sending messages from AOL account with SnapperMail. Here is the connection log:

SEND:
Authorizing SMTP
Incompatible SMTP server. (SMTP responded not OK) Failed to authorize to SMTP server on account AOL. Server replied 501
INVALID SASL FORMAT OR LENGTH
DURATION: 4
END:

It might happen twice or 3 times before the message would be finally sent. Should I adjust settings in Snapper?