How not to get flagged as spam
No mail service can guarantee that every message reaches the inbox. Use this guide to send expected mail, keep your sending setup correct, and find the delivery signals Comail reports.
If you are new to Comail, read why warming matters before you increase volume.
Your recipient list
Section titled “Your recipient list”Send mail only to people who agreed to receive it. Do not use purchased or scraped lists. Remove invalid addresses and honor each recipient’s unsubscribe request. If you resume sending to an old list, confirm that its members still expect your mail.
Comail processes complaint reports from Microsoft JMRP and Yahoo CFL. See Feedback loops for current thresholds and Atproto labels for clean-sender checks.
Message content
Section titled “Message content”Use a clear From name and a reply address that you monitor. Make the message useful and easy to recognize. Keep links relevant and use a domain your recipients can identify. For bulk mail, include working unsubscribe controls; Comail adds RFC 8058 headers to bulk and broadcast messages unless you provide either header. See message categories.
Sending patterns
Section titled “Sending patterns”Increase volume gradually and follow the limits shown for your account. Send to an old list only when recipients still expect the mail. For Comail’s limits, see warming tiers and sending limits.
Mail setup
Section titled “Mail setup”Publish the SPF, DKIM, and DMARC records shown during enrollment. Check that they stay in DNS. Comail checks the records it needs before it enables sending. See email authentication and DNS records.
Your relationship with recipients
Section titled “Your relationship with recipients”Tell recipients what they signed up for and how often you plan to write. Give them a working way to unsubscribe or change their preferences. Comail’s suppression list applies to the Comail member DID; keep your own preference records in sync.
Where comail watches
Section titled “Where comail watches”Comail shows bounce, complaint, and authentication information in the account area. See bounces and suppression, Feedback loops, and email authentication for details. Comail does not score message content at submission.
See atproto labels for what each label means and how labels can be queried publicly.
Checklist
Section titled “Checklist”Send only to people who asked for the mail. Increase volume gradually, keep the message useful and recognizable, and maintain valid SPF, DKIM, and DMARC records.