I’m hearing from multiple sources that they’ve been having problems getting mail delivered to optonline.net, optonline.com and optimum.net all day. This appears to be affecting senders across the board, from ISPs to ESPs.
It looks like something is not working right over there, and hammering retries doesn’t seem to be helping. The best recommendation is for senders to back off overnight and test some sends tomorrow.
Now that we’re deep in the middle of the Christmas shopping season, I’m seeing more and more complaints about delays at ISPs. Mickey talked about everything the ISPs have to consider when making hardware and buildout decisions in his post The hard truth about email on Spamtacular. When, like on cyber Monday, there’s a sharp increase in the volume of email, sometimes ISPs don’t have the capacity to accept all the email that is thrown at them.
Read MoreRecently, an abuse desk rep asked what to do when customers were complaining about being assigned an IP address located on a blocklist. Because not every blocklist actually affects mail delivery it’s helpful to identify if the listing is causing a problem before diving in and trying to resolve the issue.
Read MoreLast week I saw a tweet that quoted Joel Book, Director of eMarketing Education at Exacttarget as saying
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