Oh, you get that message too! I've seen it occasionally in Thunderbird.
I just dismiss it and either wait the 20 minutes or try again by selecting the account in the Folder pane, right-click and select "Get Messages".
It's not an important account for me. On 8/3/20 5:16 PM, David H. Durgee wrote:
I have been having problems with what I refer to as constipated email since 2.49.4 and it still continues with 2.53.3 at present. What I am referring to is that new email for a POP3 account will no longer be downloaded via periodic POP3 checks. When I notice that I haven't received any new email for a long enough period I then click on the "Get Messages For Account" in the pop-up menu and I then receive the following pop-up error: The POP3 mail server (pop.verizon.net) does not support UIDL or XTND XLST, which are required to implement the ``Leave on Server'', ``Maximum Message Size'' or ``Fetch Headers Only'' options. To download your mail, turn off these options in the Server Settings for your mail server in the Account Settings window. The only way I have found to correct this problem is to restart SeaMonkey. Thankfully I now have the "restart" add-on to do this and in virtually all cases that solves the problem. In a rare few cases I get the same pop-up error again and need to restart a second time. Perhaps the biggest inconvenience of this whole thing is that the periodic checks for new messages DO NOT display this pop-up when they encounter it. The pop-up error is only displayed for a manual message retrieval. Thus it can be hours before I notice that the bug has hit me again. Surely there is a way to request that periodic POP3 checks display error messages when they have a problem. That would allow me to correct the situation quickly and thus be able to respond to urgent email in a timely manner. At least until the problem can be corrected I would like to be notified that the problem is occurring again. It would be even nicer if the log of the POP3 diagnostics could be saved so that I could provide it to the developers to allow them to correct the problem. Dave
-- OS: Ubuntu Linux 18.04LTS - Gnome Desktop https://www.thunderbird.net/en-US/get-involved/ https://give.thunderbird.net/en-US/ _______________________________________________ support-seamonkey mailing list support-seamonkey@lists.mozilla.org https://lists.mozilla.org/listinfo/support-seamonkey