[Feature] Direct Reply: separate Reply-To email from account username field

[localguru]

Description:

In some IMAP/POP3 setups the login username is different from the account's email address or is not a FQDN email address. Therefore it would make sense to seperate the config field Direct Reply/Username from the actual Reply-To email address in the headers.

Server Setup Information:

• Version of Rocket.Chat Server: 0.61.0
• Operating System: Linux Ubuntu 16.04 LTS
• Deployment Method(snap/docker/tar/etc): self build bundle
• Number of Running Instances: 1
• DB Replicaset Oplog: yes
• Node Version: 8.9.4

Steps to Reproduce:

1. go to Administration/Direct ReplyDirect

Expected behavior:

Separate config field for Reply-To email address.

Actual behavior:

account user must be FQDN and can't be different from the account's email address. This is not common for all IMAP/POP3 setups.

[pkgodara]

will look for it.