Then you need to check your maillogs; check to see if the message was accepted by your SMTP server, and see what happens when it tries to send it along to the next server.
SMTP isn't very robust, but your email program will give you some sort of error if it doesn't get '200 ok' or suchlike when submitting mail. -----Original Message----- From: Af [mailto:af-boun...@afmug.com] On Behalf Of Bill Prince via Af Sent: Friday, October 31, 2014 11:54 AM To: af@afmug.com Subject: Re: [AFMUG] outlook becomes "intermittent" in satellite office It was doing this on 5.21; we upgraded to 5.26 as a test. No difference. And, it's the same router whether it's local (main office) or remote (satellite office). The symptom is that "some" email never reaches the destination only when sent from a computer in the satellite office, and only when using outlook. If the email is sent from web mail from a computer in the satellite office, it works fine. Received email is fine. Likewise, if the computer is moved from the satellite office to the main office, it works fine too. It's not recipient specific. Sometimes it works, sometimes it doesn't. Regardless of recipient. My current suspicion is that there is "something" going on with the VDSL link. It's the weakest link in the chain, and using old phone cables that were buried a couple decades ago. Maybe an MTU issue, but I'm guessing that it's load related; and SMTP is more sensitive to the issue than most other things. bp On 10/31/2014 4:18 AM, Shayne Lebrun via Af wrote: > Get rid of 5.26; in my experience, it has odd packet loss problems. > > Drop down to 5.19, or go up to 6. > > Also, what happens to the email that 'doesn't reach it's destination?' > Are you having problems sending, or receiving? > > > -----Original Message----- > From: Af [mailto:af-boun...@afmug.com] On Behalf Of Bill Prince via Af > Sent: Thursday, October 30, 2014 8:59 PM > To: Motorola III > Subject: [AFMUG] outlook becomes "intermittent" in satellite office > > > This is a bizarre set of symptoms, and I really don't know what is going on. > So I will articulate the facts, and maybe one of you can tell me what > might be wrong. > > We have a business subscriber that occupies several buildings. The > buildings are separated by enough distance that we have to > interconnect by means other than vanilla ethernet. > > Our service is delivered to their main office. Our SM is installed > there (PMP450), plus a Mikrotik router on ROS 5.26. The Mikrotik > manages 4 VLANs; > 1 business VLAN, which is bridged to the main subnet in the main office. > The other 3 VLANs are guest VLANs; each on their own > (private) subnet. > > All the computers, etc. work fine in the main office. > > The main office is connected to the "guest building" with a VDSL modem > (~~ 800' phone line between buildings). Not much occurs in the guest > building; it has a couple of WiFi APs for the guests. > > In the guest building, we've installed an RB260GS switch. It divides > the various ports out to 4 different VLANs. A couple ports are the > "business VLAN", plus 3 different "guest VLANs". The SFP port on the > RB260GS is used to connect to the "satellite office" another couple > hundred yards beyond the guest building. The SFP port is on the business VLAN. > > At the satellite office, they have 2 computers. Everything on the 2 > computers in the satellite office seems to work just fine. Web > browsing, streaming youtube, etc. > > However, when they run Outlook, "some" email doesn't go to the destination. > As far as we can tell, it gets to their off-site SMTP server (Globat), > but some of it doesn't ever reach its destination. If they use their > web-based email, the email works every time. Also, the POP part of the > email works just like you'd expect. > > Today, we moved one of the computers back to the main office, and > surprise, surprise, Outlook starts working just like it's supposed to. > > We've run extended ping tests between the satellite office and the > main office, and there is no break in the link. It seems solid. So > where/how is the SMTP part of email breaking? > > What tests can I run to figure this out? > > > -- > bp > >
