CRAM-MD5” authentication, it is throwing an exception saying “Expected response code(s) [334] but got response [530 5.7.0 Must issue a STARTTLS command first]

[arjunblg75]

Q	A
Bug report?	no
Feature request?	no
RFC?	no
How used?	Standalone/Symfony/3party
Swiftmailer version	3.3
PHP version	x.y.z

Observed behaviour

Expected behaviour

Example

The next set of error that is hindering the mail sending execution. It seems in the Swift mailer during the “CRAM-MD5” authentication, it is throwing an exception saying “Expected response code(s) [334] but got response [530 5.7.0 Must issue a STARTTLS command first]”. So you have any idea as to why this is happening or how to overcome this? I am trying further from my end.