Topic
Deliverability
How to keep your emails out of spam: authentication, sender reputation, Gmail and Yahoo bulk-sender rules, and what to do when a mailbox provider starts rejecting your mail.
Articles about Deliverability
Fernando PortelaGmailHow to resolve a sudden Gmail 550 5.7.1 (unread)
Learn how to fix Gmail’s 550 5.7.1 error and stop your emails from being rejected. Discover what triggers it, what content to avoid, and how to restore your sender reputation with Google’s reconsideration form.
- Fernando PortelaGmail
The End of IP & Domain Reputation in Gmail Postmaster Tools (unread)
Gmail quietly changed how deliverability will be measured. The removal of IP and domain reputation metrics from Gmail Postmaster Tools marks the end of an era for performance tracking.
- Fernando PortelaTips
Gmail Deliverability Issues in September–October 2025? Try this (unread)
If your emails keep landing in Gmail’s spam folder, Google’s new Sender Contact Form might help. It lets you request a review of your domain’s filtering status and possibly recover your inbox placement faster.
- Fernando PortelaMicrosoft
Microsoft’s New Bulk Email Rules (2025): What You Need to Know and Do Now (unread)
Starting May 2025, Microsoft is enforcing new bulk email rules for senders reaching 5,000+ users daily. You’ll need SPF, DKIM, and DMARC, clear unsubscribe options, valid sender addresses, and low spam complaint rates.
- Fernando PortelaGoogle
The new Google inactive account policy and what happens with email marketing (unread)
Will this modification affect your deliverability? Possibly, indeed. However, you shouldn't be concerned if you're adhering to email deliverability best practices. Don't let it impact your deliverability.
- Fernando PortelaReputation
Email postmaster tools Google, Verizon (Yahoo), Microsoft and Apple iCloud Mail (unread)
With Postmaster Tools you can track data on large volumes of emails sent and find data about your sending domain. You can view different dashboards to understand different details