[Mailer] Add support of ping_threshold to SesTransportFactory #42215
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Added support of ping_threshold option to
SesTransportFactory
forses+smtp
andses+smtps
schemes. Needed because SES closes SMTP connection after 10 seconds of inactivity andTransportException
will be thrown on next send:Expected response code "250" but got code "451", with message "451 4.4.2 Timeout waiting for data from client.".