36 lines
1.8 KiB
Markdown
36 lines
1.8 KiB
Markdown
|
---
|
||
|
|
type: reference
|
||
|
|
title: "MailPace SMTP delivery gotchas (Vaultwarden, Gmail plus-addresses)"
|
||
|
|
summary: MailPace rejects Vaultwarden emails with embedded-image attachments (450 attachments.name blank / extension blocked) — disable "Embed images as email attachments"; Gmail plus-addressed recipients hard-bounced and were auto-blocklisted, while a Gmail dot-alias delivered fine.
|
||
|
|
tags:
|
||
|
|
- type/reference
|
||
|
|
- tool/mailpace
|
||
|
|
- tool/vaultwarden
|
||
|
|
- domain/email
|
||
|
|
scope: global
|
||
|
|
date: 2026-07-09
|
||
|
|
last_updated: 2026-07-09
|
||
|
|
related:
|
||
|
|
- vaultwarden-permission-parity-gotchas
|
||
|
|
source: ruby-gems
|
||
|
|
---
|
||
|
|
|
||
|
|
# MailPace SMTP delivery gotchas
|
||
|
|
|
||
|
|
Learned 2026-07-09 wiring Vaultwarden (bitwarden.swansoncloud.com) to MailPace.
|
||
|
|
|
||
|
|
- **Auth**: the MailPace API token is BOTH the SMTP username and password
|
||
|
|
(`smtp.mailpace.com:587`, starttls). From-address just needs the verified domain,
|
||
|
|
no mailbox required.
|
||
|
|
- **Vaultwarden's "Embed images as email attachments" breaks MailPace**: test email
|
||
|
|
fails with `SMTP 4xx (450): {"attachments.name":["can't be blank","Extension file
|
||
|
|
type blocked"]}`. Fix: uncheck that option in `/admin` SMTP settings (images are
|
||
|
|
then referenced by URL). No container restart needed — `/admin` settings apply live
|
||
|
|
(and persist to `data/config.json`, overriding compose env from then on).
|
||
|
|
- **Gmail plus-addresses hard-bounce**: `bot+user@gmail.com` bounced even though the
|
||
|
|
base account is valid and plain-address sends delivered. MailPace then AUTO-ADDS the
|
||
|
|
bounced address to its domain Block List (must remove manually before any retry).
|
||
|
|
Workaround: Gmail **dot alias** (e.g. `jared.mswanson@gmail.com`) — distinct string
|
||
|
|
to the application, same inbox, delivered fine. Useful for bot/service accounts that
|
||
|
|
need a unique login email but should land in the owner's inbox.
|