Deliverability Clinic: bring your DNS and your numbers

Placement problems, bounce spikes, blocklist entries, warmup questions, domain recovery.

Before you post, have this ready:

• Sending domain setup: is it your primary domain or a lookalike, and how old is it?
• SPF, DKIM, DMARC records and the DMARC policy you are on.
• Provider: Google Workspace, Microsoft 365, or a dedicated mailbox provider.
• Number of mailboxes, sends per mailbox per day, and how long you have been at that volume.
• Bounce rate, and whether the bounces are hard or soft.
• Google Postmaster Tools reputation, if the volume is high enough to show.

The basics are in the wiki, so read the deliverability page before asking what DKIM is.

One thing worth repeating every week: if your bounce rate is above 3 percent, stop sending and fix the list before you touch anything else.