mailsetting smtp-rcpt-verification

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6.4.6

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Microsoft 365 does not accept a blank MAIL FROM:, which is the FortiMail default setting for SMTP recipient verification. Use this command to add an envelope from address to solve the problem.

Syntax

config mailsetting smtp-rcpt-verification

set mail-from-addr <email_address>

set connection-type {auto | regular | secure}

end

Variable	Description	Default
mail-from-addr <email_address>	Specify the envelope `MAIL FROM:` address to use.
connection-type {auto \| regular \| secure}	Define the connection type for SMTP recipient verification: `auto`: Attempt ESMTP protocol first, and fallback to SMTP protocol. ESMTP supports recipient verification for TLS-enforced backend connections. `regular`: Use SMTP protocol (HELO without STARTTLS). `secure`: Use ESMTP protocol (EHLO with STARTTLS).	regular

Variable

Description

Default

mail-from-addr <email_address>

Specify the envelope MAIL FROM: address to use.

connection-type {auto | regular | secure}

Define the connection type for SMTP recipient verification:

auto: Attempt ESMTP protocol first, and fallback to SMTP protocol. ESMTP supports recipient verification for TLS-enforced backend connections.
regular: Use SMTP protocol (HELO without STARTTLS).
secure: Use ESMTP protocol (EHLO with STARTTLS).

regular