[mail-dev] Introduce support for two line authentication format for OAut

[Mateusz Marzecki <mmarzecki@xxxxxxxxxxxxx>]

Hi, 

recently we have faced an issue while connecting to Microsoft’s mail servers using OAuth and POP protocol. It turns out that mail server providers can implement the authorization commands differently - using either one or two line format of authentication command. 

More details about the issue itself has been wrote down here: https://github.com/eclipse-ee4j/mail/issues/461, also the PR with the enhancement has been raised and can be found here https://github.com/eclipse-ee4j/mail/pull/477

May I ask someone from the team to have a look at this? We find it important as it have impact on customers who use Atlassian’s products. If there is anything I can do to help please do not hesitate to let me know. 

Greetings, 

Mateusz Marzecki

Development Team Leader, Jira Server