Should I use the Reply-To header when sending emai

问题:

Suppose we have an application that acts as a middleman, allowing Company A to send reports to their customers.

Company A --> Company B (me)--> Company A's customers

After getting the report we send email notifications to the recipients, but they necessarily originate from our company notifications email address e.g.

[e-mail] --> [e-mail] --> [e-mail]

Now, customers tend to reply to those email notifications, wanting them to go back to whoever sent the report at Company A. Instead, they end up back at our address, [e-mail].

A simple solution may be to change the Reply-To header on the notifications we send to the relevant Company A address e.g.

[e-mail] --> [e-mail] [Reply-To: [e-mail]] --> [e-mail]

But my main concerns are:

• the complete discrepancy in email address and domain between the From and Reply-To fields might make spam or phishing filters more eager to flag the emails
• not all email clients may respect the Reply-To field when people actually click "Reply", and just use From instead. A lesser concern, unless widespread.

Are these concerns founded at all? Or, are there other concerns I should have?

回答1:

You may want to consider placing the customer's name in the From header and your address in the Sender header:

From: Company A <[e-mail]>
Sender: [e-mail]

Most mailers will render this as "From [e-mail] on behalf of Company A", which is accurate. And then a Reply-To of Company A's address won't seem out of sorts.

From RFC 5322:

The "From:" field specifies the author(s) of the message, that is, the mailbox(es) of the person(s) or system(s) responsible for the writing of the message. The "Sender:" field specifies the mailbox of the agent responsible for the actual transmission of the message. For example, if a secretary were to send a message for another person, the mailbox of the secretary would appear in the "Sender:" field and the mailbox of the actual author would appear in the "From:" field.

回答2:

I tested dkarp's solution with gmail and it was filtered to spam. Use the Reply-To header instead (or in addition, although gmail apparently doesn't need it). Here's how linkedin does it:

Sender: [e-mail]
From: John Doe via LinkedIn <[e-mail]>
Reply-To: John Doe <[e-mail]>
To: My Name <[e-mail]>

Once I switched to this format, gmail is no longer filtering my messages as spam.

回答3:

Here is worked for me:

Subject: SomeSubject
From:Company B (me)
Reply-to:Company A
To:Company A's customers