Good to know, thanks Mike
One thing the OP can also check on
@iEagle is here:
http://mxtoolbox.com/ then enter your domain and click the MX Lookup button, then once it loads click SMTP Test.
Currently I have 2 domains on dedicated IPs that both have
SMTP Valid Hostname = Reverse DNS is not a valid Hostname and 2 domains on non-dedicated IPs with
SMTP Banner Check = Reverse DNS does not match SMTP Banner.
The former two are ones that run my forum and my business email which is related to the forum topic, so that sucks for me on both avenues. Apparently when they switched dedicated IPs they forgot to adjust the rDNS and that totally screwed everything up for months until I caught the issue. Since then, it's been just a matter of total slacker support staff issues, but I know the guy and he's been giving me a pretty decent deal so I have been giving him a pass...but that pass is about ready to get shredded.
So it used to be a lot worse...but I'm not sure how the current errors affect deliverability now vs "damage done" type of thing (bad reputation or something). Meaning, if I get it fixed, will that issue just completely disappear or what.
Then, we won't talk about GoDaddy and their Relay server which delays all mail for 4-5 minutes and then makes it virtually impossible to resolve any of the mxtoolbox issues.