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Setup Email clients

http://faq.1and1.com/e_mail/setting_up_email_clients/

  User: email address
  POP: pop.1and1.com  - 995 SSL
  SMTP: smtp.1and1.com - 587 - SSL
  : Use same settings as
  
  
  Incoming 	IMAP 	imap.ionos.com 	993 	SSL/TLS 	Normal password
  Outgoing 	SMTP 	smtp.ionos.com 	587 	STARTTLS 	Normal password