Reasons for unsolicited mail originating from your IP address
421-4.7.0 unsolicited mail originating from your IP address. To protect ourn421-4.7.0users from spam, mail sent from your IP address has been temporarily 21-4.7.0 rate limited. Please visit http://www.google.com/mail/help/bulk_mail.n421 4.7.0 html to review our Bulk Email Senders Guidelines. l41si55243084eef.158 - gsmtp
- Reason#1 Email spammers using your domain to send a lot of spam emails to other users mainly Gmail accounts.
- Reason#2 Your computer compromised & some vulnerable scripts using your outlook/thunderbird email clients to send emails on background..
- Reason#3 Poor email practices among your internal users, like unusual email forwarding to many other users mainly Gmail accounts can cause email blacklist.
Reason#1 If your domain is using Gsuit for sending emails, make sure your SPF record has includes this entry..
"v=spf1 +a include:_spf.google.com +all"
Any email receiving servers, 1st checking your emails whether it is authenticated email. Your DNS records must have proper MX/SPF records and so..
MX Records DKIM SPF Records (TXT records) DMARC Policy PTR records
Reason#3 Don’t trust your hosting provider's free email servers. Shared free email servers are really the 1st culprit for any email spam issues.
Reason#4 In addition to email authentication, I recommend your server must have a valid hostname and PTR (reverse DNS) record. Also, make sure DMARC policy, atleast set it to ' none'.
Many web hosts break DKIM because they use smarthost relays that do not sign messages properly. I have seen other hosts and DNS providers break DKIM by inserting line breaks or truncating the TXT records.
Still got email issues ? Contact a best web hosting company for help.