Re: NDR when failed to forward mail to external address, now blacklisted on backscatterer

2019-07-01 Thread Tanstaafl
On 6/28/2019, 12:52:55 PM, Bill Cole wrote: > The solution is to repackage messages as attachments inside entirely new > messages, which isn't really forwarding but remailing. ? Sounds like 'forward as attachment' to me...

OT: Re: Strategies for using backup MX records

2017-08-17 Thread Tanstaafl
On 8/17/2017, 9:28:00 AM, Phil Stracchino wrote: > This is nice in theory but doesn't work in practice, This statement is most assuredly not true in a general sense. The reality is, it works very well in the vast majority of cases. > because not every sender particularly closely follows the app

Re: Strategies for using backup MX records

2017-08-17 Thread Tanstaafl
On 8/17/2017, 8:56:53 AM, Phil Stracchino wrote: > I have a single secondary MX at a domain controlled by another competent > individual whom I know. It's useful in the event of a sustained service > outage or other delivery problems (say, if the main application server > went down and I had to r

Re: Strategies for using backup MX records

2017-08-17 Thread Tanstaafl
On 8/17/2017, 8:38:18 AM, Chris Green wrote: > What sort of strategies are available for coping with the (rare) > disconnections of a few hours that occasionally occur? I know that > SMTP delivery is fairly robust and, as far as I know, the backing off > and retrying seems to work pretty well but

Re: whitelisting to correct rbl false positives

2016-11-17 Thread Tanstaafl
On 11/17/2016 2:22 AM, Voytek wrote: > just noticed some email sent from gmail/google bouncing from my server as > sorbs RBL had that server/host listed; > > Nov 17 12:56:47 emu postfix/smtpd[16381]: NOQUEUE: reject: RCPT from > mail-ua0-f170.google.com[209.85.217.170]: 554 5.7.1 Service unavaila

Re: regexp for allowing helo host

2016-11-16 Thread Tanstaafl
On 11/15/2016 6:11 PM, Bill Cole wrote: > Be aware that if you use reject_unknown_helo_hostname you will have a > steady stream of cases for which you will have to make special > exceptions. How steady that stream is depends more on your volume and > diversity of legitimate mail than on how he

Re: alterMIME

2016-08-24 Thread Tanstaafl
On 8/24/2016 4:33 AM, Alex JOST wrote: > Am 23.08.2016 um 14:29 schrieb Lucius Rizzo: > >> I cannot praise Barracuda enough. Its absolutely necessary if you run a >> busy MTA these days and have not given up control to Office365,Google :) > > I have seen Barracudas rejecting empty envelope sende

Re: OT: dnsbl.sorbs.net - help explaining to Mozilla list maintainers why outright blocking is bad

2016-06-17 Thread Tanstaafl
On 6/17/2016 10:05 AM, wie...@porcupine.org (Wietse Venema) wrote: > [mozilla.org using SORBS as a veto] > > Looks like they disabled SORBS. > https://bugzilla.mozilla.org/show_bug.cgi?id=1280451#c5 Yes, thankfully he reconsidered after I begged... Thanks, and sorry for the noise...

OT: dnsbl.sorbs.net - help explaining to Mozilla list maintainers why outright blocking is bad

2016-06-17 Thread Tanstaafl
Hello, I've been experiencing and on/off again problem with my shared dreamhost account IP block getting listed by SORBS. The only reason I know this is because apparently the Mozilla list maintainers have configured all of the Mozilla discussion lists to outright BLOCK based on being listed by d

Re: remapping return-path ?

2016-05-20 Thread Tanstaafl
On 5/19/2016 1:50 PM, James B. Byrne wrote: > We have a situation where some party is harvesting our employees' > mailbox names and using them for a directed brute force attack against > our SMTP servers. In order dodge this we have undertaken to rename of > user mailboxes. Trying for the life o