How "heavy" is sending 100.000 mails (mailing) for a VPS server?

We have a VPS server with 512 MB RAM on a QC Xeon running cPanel and a few simple sites.

The owner of this server wants to send a maling of about 100.000 recepients (fyi. legit receipients)

His question is.
Would such a server be able to send a high volume of mails without problems?
The mail will have images that are located on the VPS. Would this cause problems?

As we do not send such big mailings ourselfs I would like to know from mailing experts what we should consider and have in mind so the mailing is sent without problems?

Is memory the only factor? How many batches should we consider? Is there standaard (cPanel) software to do this an effective way?

Thanks in advance.
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TintinConnect With a Mentor Commented:
The biggest factor in how successful you'll be in sending that volume of email is the email limits set on the VPS or mail server.

I'd suggest using Dada Mail as it has good controls for sending out email to large distribution lists.

debuggerauConnect With a Mentor Commented:
would need more info:
what size messages?
how long can it take?
What size pipe can you utilize?
What are the retry timers set to?
The types of clients pipes and server response times even have an impact..

When I send large amounts, (not that many mind you).
I restrict the queue size down to ensure not to many connections are utilized at once.
It does string out the sending time, but I have no problems with the pipe or server...

ensermoAuthor Commented:
I just received info that the mail with images etc would be around 100kb-120kb

Pipe? Do you mean bandwith? (Its a full 1Gbit network also to the Internet)

At the moment everything is set to standaard cPanel installation. (Exim standaard I guess).
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then I suspect you will be picking the server off the floor if you try and submit 100,000 at once..
I'd be trying more like 10 at a time..
If you limited the concurrent connections, you may have enough memory for about 1000...
Bandwidth (pipe) will be good, its going to be the end clients that are the issue...

Without using the cpanel for web hosting, you could probably double it again..

512MB is an extremely small amount of memory, I don't think your server could handle this job....
Memory shouldn't be an issue in sending mail, so long as you don't try to send too many at one time.
ensermoAuthor Commented:
Thanks. I think I have a better idea now of what to expect.
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