Technical Tip: How to validate the authentication between FortiMail and an email server

1. Validate the type of encoding used by the Email server: in this procedure, Base64 will be used.

To validate it, make a connection to the email server:

execute telnettest <x.x.x.x>:25
ehlo <local_domain>
auth login

If the answer is '334 VXNlcm5hbWU6', the authentication is Base64.

2. Once the encoding value is confirmed, it is necessary to convert the username and password to Base64.

In this example, Microsoft PowerShell is used:
For the user, the short name (without domain) is used:

# User

$user = "<username>"

$userBase64 = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes($user))

$userBase64

For the password:

# Password

$pass = "<Password>"

$passBase64 = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes($pass))

$passBase64

3. Once the values are obtained in Base64, the authentication is tested:

execute telnettest <x.x.x.x>:25
ehlo <local_domain>
auth login

<Value_For_the_user>

<Value_For_the_PWD>