Number of Recipients
Hi,
I have a question regarding the number of recipients per mail. If I have a list with 50 entries, does mailman send one mail with 50 recipients, or 50 mails with one recipient each?
Thanks, Julian
| | Julian Kippels | | M.Sc. Informatik | | | | Zentrum für Informations- und Medientechnologie | | Heinrich-Heine-Universität Düsseldorf | | Universitätsstr. 1 | | Raum 25.41.O1.36 | | 40225 Düsseldorf / Germany | | | | Tel: +49-211-811-4920 | | mail: kippels@hhu.de | | jabber: jukip100@xmpp.hhu.de
On 6/24/16 2:44 AM, Julian Kippels wrote:
I have a question regarding the number of recipients per mail. If I have a list with 50 entries, does mailman send one mail with 50 recipients, or 50 mails with one recipient each?
It depends. With completely default settings Mailman will send the mail in chunks of up to 500 recipients per message, but the chunks are grouped in four groups by top level domain with the .com domains in one, the .net and .org domains in a second, the .edu, .us and .ca domains in a third and the rest in a fourth.
So there will be up to 4 messages with the .com addresses in one, the .net and .org addresses in another and so on.
But, things like personalization and VERP will cause the messages to be sent individually, so 50 messages with one recipient each, and chunks are limited by SMTP_MAX_RCPTS which can be smaller than 500.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
Julian Kippels writes:
I have a question regarding the number of recipients per mail. If I have a list with 50 entries, does mailman send one mail with 50 recipients, or 50 mails with one recipient each?
That depends on your settings. If your list is personalized (eg, has links to the user's configuration page), then it will be one per recipient. Otherwise, it sends the mail in batches, how large depends on the setting of SMTP_MAX_RECIPIENTS, which defaults to 500 or something like that, much larger than your example of 50.
If the outgoing mail is batched, however, at some point (either in Mailman or in the MTA, Mark will tell you if you need to know which) the list will be grouped by addressee domain, and the message will be sent once per domain. (Possibly more times if you have a huge list.)
participants (3)
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Julian Kippels -
Mark Sapiro -
Stephen J. Turnbull