From: rich@example.invalid   
      
   Jim  wrote:   
   > On 2025-12-25 at 22:13 AST, noel  wrote:   
   >> On Wed, 24 Dec 2025 20:12:49 -0400, Jim Diamond wrote:   
   >>   
   >>   
   >>>   
   >>> Once the network was back, I tried running the queue:   
   >>>   
   >>> ------------------   
   >>> Dec 16 15:06:17 x360 postfix/postqueue[2613]: name_mask: ipv4 Dec 16   
   >>> 15:06:17 x360 postfix/postqueue[2613]: inet_addr_local: configured 2   
   >>> IPv4 addresses Dec 16 15:06:17 x360 postfix/qmgr[3285]: AA6B21E0B4C:   
   >>> from=, size=2073, nrcpt=1 (queue active)   
   >>> Dec 16 15:06:17 x360 postfix/smtp[2479]: AA6B21E0B4C:   
   >>> to=, relay=none, delay=19, delays=19/0/0/0,   
   >>> dsn=4.4.3, status=deferred (Host or domain name not found. Name service   
   >>> error for name=MY_SMTP_SERVER type=A: Host not found, try again)   
   >>> ------------------   
   >>>   
   >>>   
   >>>   
   >>> I don't know if the above bits from maillog tell you anything, aside   
   >>> from seeing that it was continuing to insist that it couldn't look up my   
   >>> SMTP server.  If you have some extra insight there, I'm all ears.   
   >>>   
   >>> Cheers.   
   >>>                                 Jim   
   >>   
   >> Jim,   
   >>   
   >> This tells me everything, the DNS failures carry through!   
   >>   
   >> run exactly this:  postsuper -r ALL   
   >>   
   >> This *should* do fresh DNS requests and send every message in your queue   
   >> if you are online   
   >   
   > Noel,   
   >   
   > thanks for the suggestion, I was unfamiliar with that command.  I will give   
   > it a try next time I have this issue.   
   >   
   > When you say "the DNS failures carry through!", are saying that postfix,   
   > rather than trying a new DNS lookup for an email in the queue, doesn't   
   > bother trying again and doubles down on its "DNS failure" thought?   
   >   
   > If so, does that sound like a bug to you?  It sounds like a bug to me, but   
   > maybe there is some other issue in play which causes that behaviour to be   
   > what is desired.   
      
   What is the setting for "address_verify_negative_cache" in your postfix   
   configuration?   
      
   Also, you may want to take a look at the "dialup configuration"   
   settings in the Postfix docs:   
      
   https://www.postfix.org/STANDARD_CONFIGURATION_README.html#dialup   
      
   While I don't recall you indicating 'why' you have intermittent network   
   connectivity, a system using "dialup" is also a system with   
   'intermittent network connectivity'.  So some settings for dialup may   
   be appropriate for your usecase as well.   
      
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