I have a centos box (vps) with sendmail and I am using it to send a newsletter to mail clients. I am using a machine in my local network to send the e-mails via SMTP (AUTH PLAIN) but after sending some e-mail (35 .. 50) the connection starts to get closed by the server (centos/sendmail).
I've searched Google for a limit configuration on number of e-mails in sendmail but didn't find anything.
What configuration can I use to allow me to send more e-mails?