We are a company with a VERY large subscriber list, and have been sending a regular newsletter for a number of years. Our list is ENTIRELY permission-based, and is very tight. Our current mass email software/server is inadequate, and we have asked our hosting company to replace it, however they claim that they won't be able to reuse the same public IP address for the SMTP server. Our DNS/IP records have never changed, and I'm very curious to know how a change in SMTP address will affect our deliverability? Does a change (or frequent changes) to our mail server address automatically increase our SPAM likelihood? Any help is much appreciated!

The 'direct' answer concerning only the SpamCopDNSBL .... it's all based on traffic 'seen' from an IP address and the reported traffic / spamtrap hits from the IP Address. Plese see; What is the SpamCop Blocking List (SCBL)? .. just one of the places that this data is offered.

..."SPAM" is a trademark of Hormel Corporation, so please do not use it here to refer to unsolicited e-mail (spam). Please see SPAM and the Internet, especially the third paragraph. Thanks!