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Make sure Sonic wall is in failover and not load balance. &nbsp;Check this article out for more assistance <a href="https://support.software.dell.com/kb/sw7497" rel="ugc nofollow">https://support.software.dell.com/kb/sw7497</a>
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Make sure Sonic wall is in failover and not load balance.  Check this article out for more assistance https://support.software.dell.com/kb/sw7497 [https://support.software.dell.com/kb/sw7497]

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It is set up as basic failover without load balancing, although I did try turning load balancing on to see if that would fix it but it didn't. &nbsp;That article is for incoming mail but I'm only having problem with outbound.
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It is set up as basic failover without load balancing, although I did try turning load balancing on to see if that would fix it but it didn't.  That article is for incoming mail but I'm only having problem with outbound.

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I found the solution myself. &nbsp;Weird issue.
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I found the solution myself.  Weird issue.

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Having a strange problem. &nbsp;We have a SonicWall TZ200 with WAN failover set up between Comcast and AT&amp;T DSL. &nbsp;The SonicWall is blocking outbound SMTP traffic on port 25 but only when both Internet connections are connected. &nbsp;If I disconnect either connection, the traffic goes out. &nbsp;As soon as I connect both, SMTP traffic is blocked but everything else goes out. &nbsp;There are not access rules set up from LAN to WAN except for the default rule that allows all traffic. &nbsp;I know it's the SonicWall because it works when I connect a computer directly to Comcast or DSL. &nbsp;The other strange thing is that we had a T1 connected prior to upgrading to Comcast and it worked fine. &nbsp;Scratching my head on this one. &nbsp;Any ideas?
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Having a strange problem.  We have a SonicWall TZ200 with WAN failover set up between Comcast and AT&T DSL.  The SonicWall is blocking outbound SMTP traffic on port 25 but only when both Internet connections are connected.  If I disconnect either connection, the traffic goes out.  As soon as I connect both, SMTP traffic is blocked but everything else goes out.  There are not access rules set up from LAN to WAN except for the default rule that allows all traffic.  I know it's the SonicWall because it works when I connect a computer directly to Comcast or DSL.  The other strange thing is that we had a T1 connected prior to upgrading to Comcast and it worked fine.  Scratching my head on this one.  Any ideas?

Outbound SMTP is blocked by SonicWall

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Broadband

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.