smtp username longer than 35 characters

[AlexJ]

Hello,

I'm using an email service through postmark and they generate usernames for SMTP auth that has 36 characters. Entering them through the CLI gives this (just an example):

Fortinet-Intello (email-server) # set username 50eovbftt91vunqul3pgy0mtr7ty2xu3qmsd
string value is too long. the size is 36, the limit is 35

value parse error before '50eovbftt91vunqul3pgy0mtr7ty2xu3qmsd'
Command fail. Return code -1

Is there anyway around this? There's no way for me to shorten the username by 1 character in postmark. This both on 5.4 and 5.6 firmware. On Fortigates 50E (same issue on 60E and 100D)