MTA and bcc field

Answered Question
Jul 5th, 2010
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Hi, I've a doubt about how any MTA see the messages with a lot of bcc. If you send an email with 20 emails to differents domains in bcc fields, all the destinations MTA can see all directions in bcc field? or the MTA only see the directions in bcc who goes to his own domain?.


Thank you in advance.

Samuel

Correct Answer by Tze Tai Mak about 6 years 10 months ago

The sending MTA will only send recipients destinating to MX gateway of that domain.


For example, mail client sends a email from [email protected], to [email protected], and bcc [email protected] and [email protected]


From sending MTA of a.com to MX gateway of b.com

MAIL FROM: [email protected]

RCPT TO: [email protected]

RCPT TO: [email protected]

DATA

From: [email protected]

To: [email protected]

Content

.


From sending MTA of a.com to MX gateway of c.com

MAIL FROM: [email protected]

RCPT TO: [email protected]

DATA

From: [email protected]

To:  [email protected]

Content

.

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Correct Answer
Tze Tai Mak Mon, 07/05/2010 - 08:38
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  • Cisco Employee,

The sending MTA will only send recipients destinating to MX gateway of that domain.


For example, mail client sends a email from [email protected], to [email protected], and bcc [email protected] and [email protected]


From sending MTA of a.com to MX gateway of b.com

MAIL FROM: [email protected]

RCPT TO: [email protected]

RCPT TO: [email protected]

DATA

From: [email protected]

To: [email protected]

Content

.


From sending MTA of a.com to MX gateway of c.com

MAIL FROM: [email protected]

RCPT TO: [email protected]

DATA

From: [email protected]

To:  [email protected]

Content

.

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