Mailer: Other SMTP
SMTP Error: The following recipients failed: cy.nthia...b.l.ac.k505@gmail.com: The recipient address  is not a
valid RFC 5321 address. For more information, go to
 https://support.google.com/a/answer/3221692 and review RFC 5321
specifications. 00721157ae682-79482789221sm13060137b3.15 - gsmtp