Unform sending mail
 

I Have two Linux servers running Redhat in the same building. They should be pretty much identical twins.

But when sending mail out through unform on one server I get

12:37:08 Encoded send of customerservice@example.com
12:37:08 Client: Y3VzdG9tZXJzZXJ2aWNlQG9yaWdpbmFscGl6emEuY29t
12:37:08 Server: 334 UGFzc3dvcmQ6
12:37:08 Encoded send of password
12:37:08 Client: Q2hlZXNlMzM=
12:37:10 Server: 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6
12:37:10 Error 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6



on the backup server I get

12:22:59 Encoded send of customerservice@example.com
12:22:59 Client: Y3VzdG9tZXJzZXJ2aWNlQG9yaWdpbmFscGl6emEuY29t
12:22:59 Server: 334 UGFzc3dvcmQ6
12:22:59 Encoded send of password
12:22:59 Client: Q2hlZXNlMzM=
12:23:00 Server: 235 Authentication successful
12:23:00 Mail From
12:23:00 Client: MAIL FROM: <customerservice@example.com>
12:23:00 Server: 250 OK <customerservice@example.com> Sender ok
12:23:00 Mail To
12:23:00 Client: RCPT TO: <to@emailaddress.com>
12:23:00 Server: 250 OK <to@emailaddress.com> Recipient ok
12:23:00 Message data (detail suppressed)
12:23:00 Server: 250 OK
12:23:00 Quit
12:23:00 Client: QUIT


what could be blocking the email from going on one server and not on the other?
any help would be appropriated

Thank you

Also, The company switched providers it was working before from the main server with their old provider, but it still is very odd that it works on one and not the other.

It could be that it is only authorized when connecting from a specific IP number. Any other number is not allowed.