Hi, I have several domain names with accents (IDN). the mail forwards for these domains work from an external mailbox (gmail), but you can't send mail to such an address from a mailbox on the ispconfig server. postfix answers: " 5.1.3 Bad recipient address syntax" I modified the master.cf file to change strict_rfc821_envelopes=yes to strict_rfc821_envelopes=no. It still doesn't work. Any ideas?