TestConnection skipped the empty-from guard that Send enforces, so with
no sender and no username configured the test issued the null reverse-path
and could report success against a lenient relay while every real
notification send kept failing with the missing-sender error. Guard the
test path the same way and surface a dedicated translated message.
The save-time validator accepts any RFC 5322 address form, so a value
like '3x-ui Panel <panel(at)example.com>' passes validation, but Send and
TestConnection fed that raw string to MAIL FROM, which strict servers
reject with 501, and buildMessage mangled it into a quoted local part.
Parse the configured sender at the point of use: the envelope gets the
bare address and, when no explicit sender name is set, the display name
embedded in the setting is used for the From header.
The notification/test email carried only From/To/Subject/MIME headers, and
the From header was the raw SMTP username. Two problems:
- When the SMTP login is not a bare email address (common with relays and
submission services), the From header has no valid address and strict
receivers reject the message — e.g. Gmail returns "550-5.7.1 ... Messages
missing a valid address in From: header".
- There was no Date (mandatory per RFC 5322 section 3.6) and no Message-ID,
which also raises spam score.
Add smtpFrom (sender address) and smtpFromName (display name) settings and
assemble the message with net/mail: a name-addr From ("Name" <addr>), a
Date, a Message-ID, and an RFC 2047 encoded Subject, in a deterministic
header order. From falls back to the username when smtpFrom is empty, so
existing setups keep working. Wire the settings through the model, the SMTP
send and test paths, the Email settings UI, and all 13 locale files;
regenerate the Zod/OpenAPI artifacts.
Validate smtpFrom in AllSetting.CheckValid (reject anything net/mail cannot
parse), which surfaces a bad address at configuration time and prevents CRLF
header injection; strip CR/LF in buildMessage as defense in depth. Add
buildMessage and CheckValid tests.
MHSanaei