Maximum number of addresses?

[Stephen Green]

Does Outlook have a limit to the number of addresses it will accept in the
To: field?

Stephen

 

[Brian Tillman]

Does Outlook have a limit to the number of addresses it will accept
in the To: field?

There must be some limit, I'm sure but it will be in the number of
characters the field will hold (tens of thousands, like16K or 64K), not the
number of addresses.

 

[Stephen Green]

Thanks, Brian.

Does anyone know the size limit? I have a link that opens Outlook (or OE,
if that's what the user uses) and stuffs an e-mail list into the To: field
(separated by . It has been working fine, but when I get to some larger
lists, Outlook refuses to even open...

Stephen

 

[Vanguard]

Does Outlook have a limit to the number of addresses it will accept in
the
To: field?

You will hit the quota limit for your e-mail account for maximum number
of recipients per message long before you hit any coding limit in
Outlook. Call your e-mail provider to find out what are their anti-spam
quotas, like:

- Maximum number of recipients per message.
- Maximum aggregate bandwidth (per day or per month) for outbound
messages.
- Maximum mail sessions per minute.
- Maximum size per inbound/outbound message.

And there are probably other anti-spam quotas that your e-mail provider
may employ. They may be reluctant to divulge what are those quotas for
fear that spammers would then program their mailer daemons to remain
under them while still managing to spew out their crap mails.

 

[Vanguard]

Thanks, Brian.

Does anyone know the size limit? I have a link that opens Outlook (or
OE,
if that's what the user uses) and stuffs an e-mail list into the To:
field
(separated by . It has been working fine, but when I get to some
larger
lists, Outlook refuses to even open...

The mailto:// URL scheme is defined by RFC 2368. It says the mailbox
parameter is "as specified in RFC 822 [RFC822]. This means that it
consists of zero or more comma-separated mail addresses, possibly
including "phrase" and "comment" components." RFC 2822 (obsoletes RFC
822), section 3.5, says "Lines in a message MUST be a maximum of 998
characters excluding the CRLF, but it is RECOMMENDED that lines be
limited to 78 characters excluding the CRLF." So you might try encoding
a CR-LF sequence (%0D%0A) into your text string for the To header but I
doubt this will work. You would need to make the string look the same
as what Outlook would produce had you inputted the recipients using the
graphical interface to Outlook.

When you are using the graphical interface to Outlook, and when you
enter a huge list of recipients (which would better be handled using
distribution list), Outlook will take care of slicing up the header
lines so they conform to the RFC to keep line lengths under 998
characters long (and probably under 78 characters long). However, when
you use the mailto:// link, you are feeding data into Outlook without
using its graphical interface, so maybe Outlook just passes on that
string that you specified for the To header but that string gets
truncated or rejected when that same overly long string gets passed to
your mail server.

Have your tried using a distribution list so Outlook can parse the
header correctly for line length? How MANY recipients is too many? You
sure you really aren't hitting the max-recipient-per-message quota
enforced by your e-mail provider?

 

[Stephen Green]

Thanks for the info.

I'm sure I'm not hitting the max-recipient-per-message quota enforced by my
e-mail provider. That's because Outlook isn't even opening, when the To:
string is large. I haven't yet figured out the breaking point. Smaller
groups work fine. The large group has 93 e-mail addresses - Outlook won't
open.

Stephen

Thanks, Brian.

Does anyone know the size limit? I have a link that opens Outlook (or
OE,
if that's what the user uses) and stuffs an e-mail list into the To:
field
(separated by . It has been working fine, but when I get to some
larger
lists, Outlook refuses to even open...

The mailto:// URL scheme is defined by RFC 2368. It says the mailbox
parameter is "as specified in RFC 822 [RFC822]. This means that it
consists of zero or more comma-separated mail addresses, possibly
including "phrase" and "comment" components." RFC 2822 (obsoletes RFC
822), section 3.5, says "Lines in a message MUST be a maximum of 998
characters excluding the CRLF, but it is RECOMMENDED that lines be
limited to 78 characters excluding the CRLF." So you might try encoding
a CR-LF sequence (%0D%0A) into your text string for the To header but I
doubt this will work. You would need to make the string look the same
as what Outlook would produce had you inputted the recipients using the
graphical interface to Outlook.

When you are using the graphical interface to Outlook, and when you
enter a huge list of recipients (which would better be handled using
distribution list), Outlook will take care of slicing up the header
lines so they conform to the RFC to keep line lengths under 998
characters long (and probably under 78 characters long). However, when
you use the mailto:// link, you are feeding data into Outlook without
using its graphical interface, so maybe Outlook just passes on that
string that you specified for the To header but that string gets
truncated or rejected when that same overly long string gets passed to
your mail server.

Have your tried using a distribution list so Outlook can parse the
header correctly for line length? How MANY recipients is too many? You
sure you really aren't hitting the max-recipient-per-message quota
enforced by your e-mail provider?

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