relayhost =
sender_dependent_relayhost_maps = hash:/etc/postfix/relayhost_maps

sender_canonical_maps = regexp:/etc/postfix/sender_canonical
sender_canonical_classes = envelope_sender
smtpd_data_restrictions = check_sender_access pcre:/etc/postfix/sender_access

contact@domain1.tld [email-smtp.eu-west-1.amazonaws.com]:25
@domain2.tld [email-smtp.eu-west-1.amazonaws.com]:25
@domain3.tld [email-smtp.eu-west-1.amazonaws.com]:25
@domain4.tld [email-smtp.eu-west-1.amazonaws.com]:25
@domain5.tld [email-smtp.eu-west-1.amazonaws.com]:25

/.*/    no-reply@domain1.tld

/(.*)/  prepend X-Envelope-From: <$1>