The other possible question you might want to ask is:

How will the message be formatted and sent... some services such as hotmail will flag the message as spam based on the multiple mail deliveries when used option #2. And there are also many other considerations related to spam.
Instead what you could consider doing:
Option #3)
Write a subroutine that would group recipients based on host, and send one mail to each host with bcc. Also I would not use the internal mail function, instead I would try a full smtp class, especially when using mime that has built in support for services such as hotmail, yahoo, etc. Whenever we send email list to hotmail users I format the message differently then when we send to yahoo, and so on .... I would avoid allowing sendmail to handle the function of grouping ...

Hope it helps...

Marek

Philip Thompson wrote:
On 10/7/07, Stut <[EMAIL PROTECTED]> wrote:
Martin Zvarík wrote:
Hello--
   I want to send email to 100+ recipients. Two choices I thought of:

1) once call mail() and use BCC, but the negative of this method is that
every recipient in BCC has header "To" same (so I used to put my email
in here - not email of one of the recipients).

2) several calls to mail() function with each recipient's emal
Why are you sending mail to 100+ recipients? Is it something you do
often? Is it always the same recipients? When are you sending them?

If it's a mailing list use mailing list software as Daevid suggested -
it's what it's for!

I would recommend avoiding the use of BCC from PHP.

-Stut



Why avoid Bcc from PHP?

~Philip


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