Because this topic appears to be generating so much interest, I'll toss
my data into the ring. Data helps everything. I'm typing this
progressively as I do the work, so that's why it doesn't read like
something in which I've already reached a conclusion before typing it.
I know I work my butt off to keep my outbound systems from sending out
spam, but I largely go unrecognized as while we're a very highly
utilized ESP, we're definitely not big enough that people routinely
think of us or even recognize us as a whole. Our utilization is,
however, above average and I feel like this is a good data set:
root@zmta1:/var/log# zgrep t-online.de syslog* | grep REJECT | wc -l
299
root@zmta1:/var/log# zgrep t-online.de syslog* | grep ACCEPT | wc -l
1718
That goes from September 21st to today. So I'm looking at, rounded up,
about 15% rejection rate by t-online.de. For comparison, let's pull the
same data points for Gmail which I expect to have a much larger data set
for:
root@zmta1:/var/log# zgrep gmail.com syslog* | grep REJECT | wc -l
40292
root@zmta1:/var/log# zgrep gmail.com syslog* | grep ACCEPT | wc -l
1971913
So around 2% rejection rate by Gmail, and around 15% by t-onilne.de. The
thing I don't like about comparing these two, though, is that my
t-online.de numbers are so small that I'm uncertain if I can draw a
conclusion that the 15% rejection rate is comparatively high. So what if
I include some stats on sending domains and their relation to the same?
I mean, for all I know in that data set from that test alone, 290 out of
299 rejections only account for one user. Let's see what I get:
root@zmta1:/var/log# zgrep t-online.de syslog* | grep REJECT | awk
-F'from=' '{print $2}' | awk '{print $1}' | awk -F'@' '{print $2}' |
sort | uniq | wc -l
22
root@zmta1:/var/log# zgrep t-online.de syslog* | grep ACCEPT | awk
-F'from=' '{print $2}' | awk '{print $1}' | awk -F'@' '{print $2}' |
sort | uniq | wc -l
168
Then again for Gmail:
root@zmta1:/var/log# zgrep gmail.com syslog* | grep REJECT | awk
-F'from=' '{print $2}' | awk '{print $1}' | awk -F'@' '{print $2}' |
sort | uniq | wc -l
2884
root@zmta1:/var/log# zgrep gmail.com syslog* | grep ACCEPT | awk
-F'from=' '{print $2}' | awk '{print $1}' | awk -F'@' '{print $2}' |
sort | uniq | wc -l
14506
Now I confess that my data set would be receiving new data as I
progressively went through these, which is more likely to favor Gmail
than t-online.de as should be obvious by this point. The conclusions in
the end were:
T-Online.de Sept21-Oct21:
299 rejections for 22 domains
1718 accepted for 168 domains
Gmail Sept21-Oct21:
40292 rejections for 2884 domains
1971913 accepted for 14506 domains
Useless data? Perhaps, but it's data, feel free to make use of it.
On 2022-10-21 14:14, Laura Atkins via mailop wrote:
No, they belong to all senders.
For instance, my mail server can connect and send mail to t-online.
I’m not the only person who has said that in this thread.
Laura
Sent from my iPhone
On Oct 21, 2022, at 6:49 PM, Gellner, Oliver via mailop
<mailop@mailop.org> wrote:
Am 21.10.2022 um 18:43 schrieb Laura Atkins via mailop
<mailop@mailop.org>:
The above statement is untrue. I know a number of mailservers that
are able to successfully send mail to t-online.de [1] and have
never contacted the tosa@ address.
Since when do those mailservers exist? Do they belong to a large
ESP?
—
BR Oliver
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