# exim -v -M 1ds9oD-00037r-TF
delivering 1ds9oD-00037r-TF
LOG: MAIN
  Unfrozen by forced delivery
Connecting to mailin-03.mx.aol.com [152.163.0.67]:25 ... connected
  SMTP<< 220-mtaig-aag04.mx.aol.com ESMTP Internet Inbound
         220-AOL and its affiliated companies do not
         220-authorize the use of its proprietary computers and computer
         220-networks to accept, transmit, or distribute unsolicited bulk
         220-e-mail sent from the internet.
         220-Effective immediately:
         220-AOL may no longer accept connections from IP addresses
         220 which no do not have reverse-DNS (PTR records) assigned.
  SMTP>> EHLO mail.tools.wmflabs.org
  SMTP<< 250-mtaig-aag04.mx.aol.com
         250-STARTTLS
         250 DSN
  SMTP>> STARTTLS
  SMTP<< 220 2.0.0 Ready to start TLS
  SMTP>> EHLO mail.tools.wmflabs.org
  SMTP<< 250-mtaig-aag04.mx.aol.com
         250 DSN
  SMTP>> MAIL FROM:<>
  SMTP<< 250 2.1.0 Ok
  SMTP>> RCPT TO:<t.seppelt@aol.de>
  SMTP<< 250 2.1.5 Ok
  SMTP>> DATA
  SMTP<< 354 End data with <CR><LF>.<CR><LF>
  SMTP>> writing message and terminating "."
  SMTP<< 521 5.2.1 :  AOL will not accept delivery of this message.
  SMTP>> QUIT
LOG: MAIN
  ** t.seppelt@aol.de <tools.kasparbot@tools.wmflabs.org> R=dnslookup T=remote_smtp: SMTP error from remote mail server after end of data: host mailin-03.mx.aol.com [152.163.0.67]: 521 5.2.1 :  AOL will not accept delivery of this message.
LOG: MAIN
  Frozen (delivery error message)