Emails issue Post: 302824005

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Operating Systems Solaris Emails issue Post 302824005 by hasan.kamali on Thursday 20th of June 2013 05:42:25 AM

06-20-2013

Registered User

Hi,

I'm Junaid Subhani's team member. Let me further clarify our email architecture for our system email alerts.

All unix/linux machines sendmail client is set to use two MTA relay sendmail servers internally in our network.

Then those two MTA relay sendmail servers forwards all the email to our company's microsoft exchange server (Microsoft servers are managed and administered by a seperate windows team).

Then mircosoft exchange server delivers the system alerts to valid microsoft exchange email IDs, e.g. xyz@waridtel.com.

So basically submit.cf of all the client machines has the IP address of internal network MTA relay sendmail server and MTA sendmail relay server has the IP of Microsoft exchange server for D{MTAHost} in submit.cf.

All the system email alerts configured by us and different application/database team (in their scripts) is properly being delivered.

Now the problem we are facing is this. Along with all the system alerts emails, all of the sendmail client machines are also sending out native OS users system generated emails (to the native user ) as well. And ...... our internal network MTA relay sendmail server obviously also relay them to our domain's microsoft exchange server, which obviously cannot recognize the destination address (e.g. user@server-hostname.waridtel.com) floods our outbound email gateway (sendmail server) with all those unwanted emails and overwhelms the mail queue.

So far, we concluded to use '.forward' option to at least deliver all the emails to proper email address (xyz@waridtel.com) of the respective owner team of the unix/linux system user. That way our corporate outbound sendmail email gateway will not be brought down due to 100,000+ unwanted system users email everyday.

Another option we have read somewhere is to configure /etc/mail/access file on the internal MTA relay sendmail server, which would discard or reject any email addressed to user@server-hostname.warditel.com. But we are not sure about the syntax to be used. Whether we can use wild card options to reject/discard all emails addressed to user@server-hostname.waridtel.com or we have to add lines for each and every user of all the servers.

hasan.kamali

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LEARN ABOUT DEBIAN

mail::verify

Mail::Verify(3pm)					User Contributed Perl Documentation					 Mail::Verify(3pm)

NAME

       Mail::Verify - Utility to verify an email address

SYNOPSIS

	   use Mail::Verify;

DESCRIPTION

       "Mail::Verify" provides a function CheckAddress function for verifying email addresses.	First the syntax of the email address is checked,
       then it verifies that there is at least one valid MX server accepting email for the domain.  Using Net::DNS and IO::Socket a list of MX
       records (or, falling back on a hosts A record) are checked to make sure at least one SMTP server is accepting connections.

ERRORS

       Here are a list of return codes and what they mean:

       0      The email address appears to be valid.

       1      No email address was supplied.

       2      There is a syntaxical error in the email address.

       3      There are no DNS entries for the host in question (no MX records or A records).

       4      There are no live SMTP servers accepting connections for this email address.

EXAMPLES

       This example shows obtaining an email address from a form field and verifying it.

	 use CGI qw/:standard/;
	 use Mail::Verify;
	 my $q = new CGI;
	 [...]
	 my $email = $q->param("emailaddr");
	 my $email_ck = Mail::Verify::CheckAddress( $email );
	 if( $email_ck ) {
	     print '<h1>Form input error: Invalid email address.</h1>';
	 }
	 [...]

perl v5.8.8							    2002-06-09							 Mail::Verify(3pm)

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