Define SMTP Test username and password

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Hey guys,

Is there a way to use different SMTP usernames for the test smtp server?

For eg my setup:

define('PHPMAILERHOST', 'smtp.sendgrid.net');
$phpmailer_smtpuser = 'apikey';
$phpmailer_smtppassword = 'xxxxxx';

define('PHPMAILERTESTHOST','mail.testhost.com');
$phpmailer_smtpuser = 'email@testhost.com';
$phpmailer_smtppassword = 'test password';

Is there a way i can set different SMTP Creds for the test host?
Thanks