[ubuntu] Postfix not receiving email

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http://ubuntuforums.org – I have just installed postfix for the first time every and seem to be able to send emails just fine, but I cannot receive them. I think the following might be a hint in the logs? Dec 18 19:04:46 kitty postfix/error[6288]: 34FE5627B1: to=<[email protected]>, relay=none, delay=153258, delays=153224/34/0/0.22, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to sandowne.dlinkddns.com[]:25: Connection timed out) Any help would be appreciated. Thanks, Keith (Hardware)