Sitemorse tests all the mail servers listed for your domain, including the backup ones that are in general infrequently used. We can find hidden problems that only occasionally surface in normal use.

However, in some cases an ISP deliberately blocks servers from talking to your mail servers, which can cause an Access Denied error message.

Ask your ISP to un-block our servers IP addresses ('89.234.59.74' and '89.234.59.75'). Please note that during Sitemorse's testing, it talks to your mail servers, but it never actually sends any email through them. Thus, there is no need to block our servers - it would not result in you receiving any junk mail or test messages.