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In your config, is ip inspect SMTP enabled?<br />
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If it is, turn it off and let Ironmail do the inspection.
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In your config, is ip inspect SMTP enabled?

If it is, turn it off and let Ironmail do the inspection.

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Negative. &nbsp;It is not enabled. &nbsp;
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OK. &nbsp;So that's what I ended up having to do. &nbsp;I created an access-list for all smtp traffic, the appropriate class-maps and &quot;pass&quot; for the action. &nbsp;
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OK.  So that's what I ended up having to do.  I created an access-list for all smtp traffic, the appropriate class-maps and "pass" for the action.  

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Hello all,<br />
We have recently replaced our premise router with an ASR. &nbsp;We established a Zone Based Firewall since reflexive ACLs are no longer supported. &nbsp;The problem we are having now is that SMTP traffic is SLOW. &nbsp;External mail coming in with no attachments seems o.k. but when adding an attachment it can take hours. &nbsp;In fact the last test took 13 hours to make it through. &nbsp;At first we thought it was the Ironport but when talking with Cisco they said that it looks fine and normally the symptoms present themselves when there is packet inspection before the mail hits the Ironport. &nbsp;Is there a way for SMTP to bypass the inspection policy but still be allowed through? &nbsp;
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Hello all,
We have recently replaced our premise router with an ASR.  We established a Zone Based Firewall since reflexive ACLs are no longer supported.  The problem we are having now is that SMTP traffic is SLOW.  External mail coming in with no attachments seems o.k. but when adding an attachment it can take hours.  In fact the last test took 13 hours to make it through.  At first we thought it was the Ironport but when talking with Cisco they said that it looks fine and normally the symptoms present themselves when there is packet inspection before the mail hits the Ironport.  Is there a way for SMTP to bypass the inspection policy but still be allowed through?  

Bypass Zone Based Firewall

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Network Operations includes asset management, help-desk supervision, security and user policies, infrastructure administration and anything else that affects the operation of your network. Discussions will include those of best practices in platforms, configurations, performance, security and accounting.

Network Operations

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.