Looking for some help with trying to figure out who is responsible here. I think it is Embarq but even if it is I don't know what to do about it.
I have a small consulting business and my domain/website/email is hosted with 1&1 Internet. My email account is the only email account on my domain and I really only send about 10 - 15 emails a month. The email account is not used and has never been used for marketing. A few weeks ago I was attempting to reply to a customer with an embarqmail.com email address and within 24 hours I got a bounce back messages stating the following.
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its recipients after 25 hours.
The message has not yet been delivered to the following addresses:
SMTP error from remote server in greeting:
host smtp.embarq.synacor.com (208.47.184.2):
421 4.7.0 (C2) Too much spam.
No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you.Now to make things more interesting; one of my customers is a local engineering firm and they also have a hosted domain/website/email from 1&1 (which I manage) and they are also having the same issue. Any email from their domain sent to the embarqmail.com domain is getting bounced back for "Too much spam".
I have contacted 1&1 support before for the engineering firm and 1&1 basically told me it is because of spam - more specifically the individual who was having the issues - more than 50% of their messages were being manually or automatically marked as spam. They advised a "cool down period" of not sending any email to the embarqmail.com for a few days to see if the domain would automatically get off any lists. I don't see how this is remotely possible - again because the email is only used for communicating with local clients and not marketing or anything. After arguing that point with 1&1 and a few months later they plead there are no issues on their side and recommend that I contact Embarq because the issue is on their end.
I have contacted 1&1 support about my package this morning to see what their response is this time and I haven't heard back from them as of yet.
According to MXToolBox the 1&1 mail servers aren't on any Blacklists and neither are either of the domains. From a few tidbits I am reading online it sounds like Embarq uses Spamhaus and checking the mail servers & domains straight through Spamhaus directly again shows no issues.
So if these mail servers & domains aren't on any blacklists what the heck is Embarq's mail servers looking at to block these domains from sending messages through? And better yet - what the heck am I supposed to do about it to resolve it?
Thanks for any information or recommendations.
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