Been in contact with my host, here's what they had to say.
Quote:
Hello,
We are sorry for this inconvenience.
We have done numerous tests on this issue with many of our servers and we found that this is an intermittent issue that we cannot prevent. The email being sent from our servers is being sent correctly and Yahoo is deferring them at random, with no warning or notification.
We have no control over yahoos incoming smtp server's capabilities or policies.
Yahoo is deciding to defer messages coming from not only our shared servers, but any shared server hosting multiple domains.
We urge you to contact yahoo on this issue as they may provide you with additional support and information on the issue, although this is unlikely.
Please do not re-send your email as this will result in more of a delay and will result in more connections to Yahoos servers and will result in the deferred error messages.
In addition, ensure that any mailing list you have is updated to ensure there are no yahoo users who do not want your email. this will help reduce unwanted smtp connections on yahoos end.
As well, if you have forwarders in place pointing to Yahoo addresses, please remove them as they are forwarding spam to yahoo, cauasing more unwanted connections.
The following links might be helpful in getting answers to the questions you have and explinations on the issue from a wide range of users with different isps and webhosts:
As well, I googled 'Yahoo temporarily deferred' and found a wealth of information relating to the topic. You may wish to do this as there may be more information out there that you wish to see.
Note that you may want to consider an upgrade to a dedicated server plan or the virtual private server plan, on which your email service would not be affected by any other user, only email coming from your domains would be coming from your server.
I understand this isnt a solution or correction to the issue, but I can only offer suggestions advice and information as Yahoo chooses to defer these messeages from shared servers at random.
We appreciate your understanding of the matter.
If you have any more questions or concerns, please do not hesitate to contact the Lunarpages Help Desk again.
Seems rather OTT to me, Yahoo! are just a joke. My host is trying to get me upgrade to a VPS or dedicated server -- how nice!