[Info-vax] SMTP chunk sizes

[Rich Jordan]

On Tuesday, March 24, 2015 at 5:42:05 AM UTC-5, Jan-Erik Soderholm wrote:
> Rich Jordan skrev den 2015-03-24 00:55:
> 
> 
> > Using the windows server as smarthost is fine for small mail so far.
> > However I just sent the same email message that would take 15-20 minutes
> > to get to GMAIL, and would die going to MS in 10 minutes, and it took
> > over 75 minutes to send from the Alpha to the PC (on the same LAN...).
> > That was the 10.8MB body message (all text).  The same text file
> > attached (and so uuencoded) is at 78 minutes now.
> 
> A few things...
> 
> How does a simple plain FTP perform over the same NIC?
> I have seen weird results from miss-configured full/hald duplex
> where such things like FTP close to hangs. Usualy the VMS NIC
> set to full dupl and the switch auto sensing down to half dupl.
> 
> This 10 MB "all text" message, is that a real life example?
> You are not concidering a ZIP of the file before mailing?
> Or putting it in a directory served by WASD (or similar)
> and then only mailing the URL?
> 
> Jan-Erik.
> 
> >
> > Once it got to the windows server it appeared to take about 2 minutes to
> > get to me, so thats good, but we'll have to see if anything can be done
> > about the intersystem pokiness.  I'll try and get a packet trace
> > tomorrow.
> >
> > And I think the scanners and PDF generators can just send direct to the
> > PC server too.  We'll see.
> >
> > Thanks all for the info.
> >
> > Rich
> >

Jan-Erik
     it was just a test, using a large log file.  Same one I had been using to test with Microsoft support.  The problem files that the customer generates are most often large multi-page PDF documents that can run to 20MB or more.  And no, they usually don't ZIP them ahead of time, but have been doing so manually to get some files through to the O365 recipients.