>
>
> " Mass mailing system where we have around 50000 mails to be sent at a
> time. This will repeat for at least 15 times per month."
>
> What is the best option I can suggest him?

qmail with mailing list


> I had suggested to go for dedicated server on which I'll provide him a
> qmail server setup. Will qmail will be able to handle so many mails a day?

sure, also it depends on available bandwidth & concurrencyremote


> What are the possiblities of getting mails mark as Junk?

1) forward & revers lookup for public ip configured to send / receive
emails.
2) proper email id list. minimum should bounce / reject. Unsubscribe option
should be given on news letter to avoid users marking you as spammer.
3) mailing list should be configured to remove invalid email ids from list.

this is all I can recommend, there should be other precautions also.





-- 
Regards
Dhaval Thakar
http://www.linuxreaders.com/

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