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Emarsys: The Complete Guide to E-Commerce Email Marketing
Emarsys just issued a interesting post:
The most comprehensive “Handbook of Email Service Providers“!
All SpamAssassin rules in one place, EXPLAINED!
All SMTP/ESMTP commands and reply codes in one place, EXPLAINED!
Check the DNS records of your domain with our free DNS tool.
The most comprehensive Email Deliverability and Marketing Glossary!