SMTP Mail Error

aniruddha_majumdar

Hi Experts,

While trying to send a mail through SMTP protocol using the SmtpMailXControl1.ocx its giving a SMTP error. Error number 10035.

If anyone is having the ans ..plz reply.

Thnaks & regards,
Aniruddha

Poltergeist

Some desktopfirewall software which is blocking port 25?

aniruddha_majumdar

Thanks,

Still I am getting the same error even after changing the firewall setting in Windows Firewall->Advanced Tab and changing Lan Area Connection--> Advanced setting and ticking Internet Mail server (SMTP).

Please help. ](*,)

Poltergeist

First of all: can you telnet to the SMTP port on the mailserver (try telnet <servername> 25 from start->run). If you can, don't bother with firewalls, if you can't, there is still probably some other software blocking the port, like antivirus software (I know mcafee enterprise by defaults blocks port 25)

aniruddha_majumdar

Dear Poltergeist,

Then how safe is mailing through SMTP protocol, if the port has been blocked by Antivirus.

Regards,
Ani

Poltergeist

It's the default port for sending mail using SMTP. You won't find many servers which use another port to accept SMTP mail. Sending mail through SMTP is safe. It's blocked by some software because some malicious software also sends e-mail. Know all the spam you're receiving? lot's of these mails are send by spambots on computers which it's owner even doesn't know it does this.

If you're sure you don't have this kind of software on your computer (which should be detected by antivirus software and the likes) it's perfectly safe to open up the port - from the inside to the outside. You won't be receiving mail through SMTP, so the other way around is not necesarry

aniruddha_majumdar

Hi Poltergeist,

Ours is a office setup which is using Microsoft Exchange Server in that case where the port no. 25 to be opened.

May the question is silly for u.. but still answer. [-o<

regards,
ani

Poltergeist

To be able for your server to receive e-mail through SMTP, port 25 needs to be opened on the server. It probably is, otherwise you would not receive any mail at all (assuming you don't use a POPreader). Check with your systemadministrator if port 25 is opened on the Exchange server. He can test it quite easily by telnetting on the server to localhost 25

To be able to send e-mail to your server, port 25 needs to be opened on the server and on the sending PC. If it's not, because it's blocked by some software, you will not be able to connect to the server. You can test this yourself by going to start->run and type telnet mailservername 25. If it works, you'll get a 220 <mailservername> microsoft .... message and you know you have to investigate further. If you don't get a message but the window immediatly dissappears, the port is not open.