Over the course of the past few months our low volume mail sends are completely bouncing at Gmail with responses similar to this: "Our system has detected an unusual rate of unsolicited mail originating from your IP address. To protect our users from spam, mail sent from your IP address has been blocked. Please visit http://www.google.com/mail/help/bulk_mail.html to review our Bulk Email Senders Guidelines." Has anyone else been seeing a lot of these lately and if so, do you have any advice on how to address this issue? Sorry if this has been addressed elsewhere, but I couldn't seem to find any relevant threads. Thanks! Eric
Thanks for the advice. So you are suggesting I bind the existing IPs with new domains (and thus new link domains)? If so, I can't see how that can help much. Even if it did, wouldn't it just be a short term fix? Thanks, Eric
When you say "rotate", are you suggesting I can only use and IP and domain for a single day and then have to get new ones?
No doubt there are other strategies, but yeah that's how we do it. Rotate through a range each day then after several days come back to the original one and you should be fine. You'll need multiple IP blocks and domains for this
I use 1 IP/Domain per hour pretty much heh, because I don't churn I just burn. I also Mail GI . But yeah I get hit with this stuff all day long when Gmail records slip in with my GI records.
Gmail's own postmaster blog says this will go away after a couple of weeks.. so if you want to hit it daily then like others have suggested get some IP and domain rotation in play.. run rest rest rest run rest rest rest run.. you get the idea. Just out of curiosity Eric, what volume was your "low volume"?
Thanks for the follow up. Low volume is less than 10 emails an hour! What would you suggest for a rest cycle? Daily, hourly, etc? Thanks! Eric
If you get any kind of "spam" related feedback from gmail servers I would recommend you turn of the IP for 24 hrs .. (I am assuming you are not pushing on one IP address).. if you are solo IPing it the only thing you can do is clean up your list to clickers only and slowly add other gmail records but be aggressive about purging and keeping good clicker ratios. As others suggested using new domains in redirect links and MTA froms may help a bit as well.
To start off, you can try with single SMTP outconnection and 20 emails per connection. With this setting, send 200-500 emails daily over a period of 4-8 hours. Your best bet is to send emails to seed addresses for atleast a week. Then increase the number of SMTP connections till 10 gradually. Let me know if it helps, worked for me.
I have had limited success rotating massive amount of link domains. It did great for about a week before gmail cooked the range for 2 weeks. It was getting decent volume (500/minute on a /22 ) and making about $100 a day, which is not a terrible addition considering I was not focusing on gmail. The point is rotating link domains worked to keep pushing mail through until gmail got tired of it and just blocked the range for who knows how long (maybe 2 weeks like others have said, I got a preemptive sbl on the range for god knows why). It definitely seems like the toughest filter out there. I planned to give it a shot again one more time this time focusing on lowering the per minute rate.
I would suggest only IP rotation not Domain. Have several IPs with one TLD but different subdomains. Have few spare TLDs which will be relevant to your email campaigns. When sending email, return path should reflect original domain say [email protected].com, but from address should be [email protected](Owned domain). In this setup you may choose to have DKIM signing domain as foo.com or creditscores.com(recommended). Once email arrives inbox you should see 'via' header populated in Gmail Email. Now you keep on rotating IP and from address domain per campaing keeping foo.com as TLD for IPs. This helps filter to identify that foo.com has large mailing history. For Gmail we have realised that sending emails through scripts is very difficult as containt gets blocked quickly. Also sending very low volume emails is not going to get us anywhere. We deliver emails with 1 smtp connection and 20 msg/connection. For warmup we deliver 100 emails in one go stop for 4 hours then deliver again. After a week we increase connections and volume. To establish any reputation you would need to send atleast 2000 to 3000 emails per day, but you can not go there in a day witth gmail During the warmup process you most likely loose 50% Ips but they do come back after 15 days or so depending upon spam complaints so better start with seeds first. Following these techniques, we were/are able to deliver 100K per IP without block. Best way to avoid 421 is wating and continuously monitoring impression rate (increase delivery if the rate increases). We have used more than 3000 IPs for Gmail but 550 is extremly rare Constantly rotating IPs and Domain for Gmail is as good as burning them.
