I have a web & email hosting account so my email is on my own domain. A while back I wrote on this topic: http:\/\/mclements.net\/blogWP\/index.php\/2024\/02\/06\/email-send-blacklisting-ip-addresses\/<\/a><\/p>\n That turned out to be a temporary solution and the problem kept recurring. I recently devised a permanent solution. I’ll describe this solution first, then get into the story of how I discovered it.<\/p>\n Here’s what happens when I send an email from my own domain. Consider the email as foo@bar.com<\/strong> sent using MyHost<\/strong> SMTP servers.<\/p>\n This ensures that the IP address associated with email sent from the MyHost<\/strong> account is not my Comcast assigned IP address, but that of GMail’s SMTP server. Thus, it passes all the various internet email security checks.<\/p>\n As I mentioned above, the problem kept recurring. I send email and sometimes it is rejected with a reply that looks like this:<\/p>\n I checked whether this IP address is blacklisted at this site: https:\/\/mxtoolbox.com\/blacklists.aspx<\/a><\/p>\n It shows more than 40 different blacklists, all but 1 of which are green \/ OK. It was blacklisted by Spamhaus ZEN with reason PBL. In their words:<\/p>\n In other words, internet SPAM and security has gotten so bad that servers don’t accept email from any IP address except those pre-cleared as public SMTP servers. When it comes to delivering email, they have shifted from blacklisting to whitelisting.<\/p>\n Previously I thought I could solve this by using the IP for my DNS name, instead of the one assigned by Comcast. But my hosting provider refused to do that and it wouldn’t help anyway.<\/p>\n Google has employees whose job is to keep their SMTP servers on all the whitelists and off all the blacklists. When my hosting provider’s SMTP server sends email, it uses the IP address of whoever called it. If I can get Google’s SMTP servers to call my hosting provider’s SMTP server, then my email will deliver with a whitelisted Google IP address.<\/p>\n And Google provides a method to do exactly this!<\/p>\n Before starting, have the information for the SMTP server you want to use: hostname, login name, password, etc.<\/p>\n Point your browser to https:\/\/gmail.com<\/a>, go to Settings, See all Settings, Accounts and Import.<\/p>\n In the “Send mail as” section, check the button for Reply from the same address the message was sent to<\/span><\/strong>.\u00a0 Then click the link Add another email address<\/span><\/strong>. Follow the instructions in the window that pops up to verify the email account and SMTP provider.<\/p>\n Next, go to your email client settings and tell it to use the GMail SMTP server to send mail for your hosting provider email.<\/p>\n That’s it – you’re done.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction I have a web & email hosting account so my email is on my own domain. A while back I wrote on this topic: http:\/\/mclements.net\/blogWP\/index.php\/2024\/02\/06\/email-send-blacklisting-ip-addresses\/ That turned out to be a temporary solution and the problem kept recurring. I recently devised a permanent solution. I’ll describe this solution first, then get into the story … Continue reading Email, IP Addresses and Blacklists<\/span> How it Works<\/h3>\n
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The Symptom<\/h3>\n
host eig-east.smtp.a.cloudfilter.net [18.215.58.191]\r\nSMTP error from remote mail server after end of data:\r\n550 Gk0Tt29WcHdOCGk0UtJxy2 - <foo@bar.com> message rejected AUP#SNDR<\/pre>\n
PBL<\/strong> - Spamhaus PBL is a DNSBL database of end-user IP address ranges that should not be delivering unauthenticated SMTP email to any Internet mail server except those provided for specifically by an ISP for that customer's use<\/span><\/pre>\nThe Solution<\/h3>\n