security - Can a mail-sending program send mails under my email? -


i'm new smtp techniques few days work it, have question - can mail-sending program send mails under email?

it seems can put email in from field , if put friend's email there, can disguise him!? sound strange since believe being 1 else not ease @ all.

please guide me if have experiences on this.

any email client can send email using email address field.

that said, lot of receiving mail servers configured various tests ensure email coming real mail server.

for list of techniques used receiving mail servers go here: http://en.wikipedia.org/wiki/anti-spam_techniques "automated techniques e-mail administrators" section.

a short list there is:
1. reverse dns - tests ip address of sender ensure ip listed mx record domain.
2. fcrdns - receiving mail server attempt smtp helo or ehlo command sender's ip. makes sure sender smtp server.
3. disallow dynamic ips - receiving server test sender's ip see if dhcp'd. if so, mail marked spam.

point is, can send email being originated email address. however, there huge possibility email deleted receiving server.


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