I have two email accounts/identities (jon@rana.se and jon.loman@zooekol.lu.se). For jon@rana.se I recently changed host. It all seemed to work well with the exception that when I tried to use identity jon.loman@zooekol.lu.se and send from the "rana.se" SMTPserver it refused to touch it. In the "New mail folder" there pops up, by magic, an entry; "Mail Delivery system (sent by "Mail Delivery System"). The message reads: "Sender address rejected: not owned by user jon@rana.se". I can see some logic in this but my old @rana.se" host never made any trouble. Now something has happened and even when I use identity jon@rana.se I am greated with the same response. This started yesterday and sometimes happens, sometimes not. To my knowledge I did not change anything in the Pegasus installation. When it happens I assume the email never get through. It is possible that emails to some recipients go through, other not. Or that there is a random temporal variation.  ??????????????? Some cache involved?? My next step will of course be to contact the email SMTP host (One.com). However, I supect they will blame it on Pegasus. (Se also my post "Sticky queued email"). Receiving email is not affected. (1) Can you help? (2) if you can not, there is one more question the answer to which may help me debug this. What does the SMTPserver really know about the email it handles? When I edit the "Network configuration", "Sending (SMTP)" enty I enter the name of the SMTP server. Nothing more (for the POP/IMAP server I also give a username and a password). With the email  goes I assume it contains my email address as entered in "Internet Mail options", "General". This is jon@rana.se for one of my identities (and jon.loman@zooekol.lu.se for the other). But is there anything more hidden that gives my idnetitiy (and may have been misnamed ibn some panel)?