Send Later Extension Progress

I did not intend for this to take so long, but here we are. There is a lot of progress going on in the development of the “Send Later” extension version 1.2.0 and a couple of beta versions have been tested by few of the users and some of their feedback has been incorporated into the extension. I hope to release this as soon as possible, please hang on :-). Meanwhile, if you are interested in beta testing please leave a comment below, I will try to entertain as many as I can before the list gets too big.

Have a nice day y’all.


BerwynMay 10th, 2007 at 09:17


SendLater *almost* looks like it does what I want: It seems to send in the background, and that’s what I’d like. But I have some queries.

1. But I can’t for the life of me figure out what SendLater is doing when it’s network throbber is going. Is it checking the “Unsent” queue? Surely that’s instant. You’d think it would throb when it’s actually sending messages over the network, but mine throbs even if there are no unsent messages. Is it checking messages? But TB already does that. Are there some docs I’ve missed?

Anyway, if it did do the obvious and throb only when sending messages, then a good feature would be to click it to halt it. Anyway, I don’t like something throbbing in my peripheral vision all the time (maybe a really small icon-type throb would be ok. But if it only did it when it was sending queued messages, then the current big throb would be good because it would only happen when I actually had messages queued, not periodically.

2. The real feature I want is a delayed background-send. Now, sendLater does this, but it makes you click on that annoying scheduler every time. I just want to set up something like a 1-minute delay in the options and have it always send my mail 1 minute after I hit Ctrl-Enter. You could add this feature to sendLater by having an option in the options dialog that asks “Fix schedule to x seconds after hitting send” - whereupon it will no longer pop up the scheduler.

Does that make point 2 a minor feature? I’d love to be a beta tester if it does point 2.

Many thanks,
And good luck with the next release!

Karthik SMay 10th, 2007 at 10:43

Hi Berwyn,

1. When the throbber is active it basically means it is checking the various draft folders for pending messages [for IMAP folders this means that there has to be a login, retrieve draft folder etc]. I will look into making this a bit more discrete, but it was made with the intention of signifying whats happening in the background.

2. The new version [currently in beta] does have a similar feature where there are shortcut buttons that are fully configurable to provide a “Send after 1 minute” button.

I will add you to the next beta version.


TonyMay 10th, 2007 at 23:57

This is a great extension but it seems to be sending the same message twice. Any ideas what’s happening.?


BerwynMay 11th, 2007 at 06:51

Thanks, Karthik. You say the new version has configurable “Send after 1 minute” buttons. That’s absolutely fabulous! Are you also planning to make shortcut keys for these buttons (or one shortcut key that is configurable?)


Karthik SMay 11th, 2007 at 10:15


That should generally not happen, if you are interested I can contact you to help me make some debug logs, and figure out what is happening.

There will be a new beta going out tonight, so I guess you can see for yourself ;-). You will still need to press CTRL+SHIFT+ENTER then hit CTRL+1 for the first shortcut.


RonMay 12th, 2007 at 12:59

Hi, I’ve had this extension installed since I saw you mentioning it on Lifehack (as an alternative to that other extension which doesn’t work with TB2). I’ve only just gotten around to trying it, and I find that it’s not working. I’ve tried various tests, I think it perhaps has something to do with another extension I have installed… Not sure which, and the error console isn’t very informative, but I’m _thinking_ it’s Enigmail. If I can provide testing or something, I’d be glad to help (anything to get this extension working!)

Karthik SMay 12th, 2007 at 18:36

Hi Ron,

I will contact you by email with instructions on how to help in the debug process.


KevinMay 14th, 2007 at 01:43

Hi. I really like the idea of the extension, but if I enable it, it locks Thunderbird up. Possibly an extension conflict, I’m not sure. Could you send me information on how to give you debug logs?


LeeMay 18th, 2007 at 06:03

Forgive me if this is a duplicate comment. I feel as if I saw a similar one elsewhere on this site, but let me humbly suggest that new versions of the extension indicate (perhaps with a separate column in the drafts and/or unsent folders) when each message is schedule to be sent, not when it was saved to the folder.

I currently use Eudora which has this functionality built in. (You can “change queuing” of each individual message and the scheduled date is the one that appears in the outbox). I would like to switch to Thunderbird as I am told it is more stable. The only thing keeping me from it is this option of scheduling messages for transmission, which I use quite a lot.

Thank you for your work on this!

RonMay 19th, 2007 at 10:32

Hi Lee, and anyone else that wants to see when the messages are scheduled to be sent. You can install Mnenhy, which allows you to customize what headers are and aren’t shown. SendLater has its own header, so if you install Mnenhy, you can then choose to display the header “X-Send-Later-At” (I had to manually add the header to the list in the Mnenhy setup). It’s quite convenient. :)

LeeMay 20th, 2007 at 05:24


Thanks. I installed Mnenhy, manually added “X-Send-Later-At” to the “Extended Normal View” list, but the new column doesn’t appear. (I also made sure that Extended Normal View was selected in the Headers list in the View menu.) Any suggestions?


RonMay 20th, 2007 at 05:59

Lee, with Mnenhy, the info isn’t a new column, it’s in the header pane with the “sender”, “subject”, etc. information, and will only display if that header line is present in the selected email. Here’s how I have it configured in the Mnenhy header list.

Header: X-Send-Later-At
View Format: Text
Display Name: X-Send-Later-At
Sort String: x-send-later-at

And then just make sure it has a checkmark next to it (by default it won’t).

I’m not aware of any current methods for customizing the columns (except maybe developing a new extension…)

LeeMay 20th, 2007 at 09:38


Thank. I see what you mean about the headers as opposed to columns. Thanks for pointing that out.

I used the settings you specified, and it appears to me that I have it all set up properly, but X-Send-Later-At still does not appear in the header, despite the fact that I have checked that header in the “extended normal view” option in Mnenhy.

Could this be because I am using the new version of Thunderbird Or that I installed the Send Later extension before the Mnenhy extension?


RonMay 20th, 2007 at 10:58

Sorry Lee, I’m stumped as well. I too am using the latest TB2, so it can’t be that. I don’t think the order of install should have an impact on final operation (for unrelated extensions like this, at any rate). Other than adding in this header to be displayed, and disabling the Mnenhy options “Text Codecs” and “Registry Viewer” (neither of which should have a relevant impact in regards to displaying the SendLater header), I’ve not done much with Mnenhy. I’m sorry that I recommended something that currently isn’t working for you, but hopefully you can get it to work!

LeeMay 22nd, 2007 at 00:07


It was worth a try, and I’ll fiddle with it and see if I can get it to work.

Hopefully, the Send Later extension will incorporate this function (preferably in the form of a column, like in Eudora, so one can glance down the list and see when messages are scheduled for delivery). Then I won’t have to worry about Mnenhy!

Again, thanks.

scottMay 22nd, 2007 at 12:34

Can I try the beta for sendlater. I want to use it with Thunderbird 2.0. I write emails at 3 am in the morning, and want to send them out at 9am. I don’t want people to know that I’m up writing mail at those ungodly hours.


EricMarch 9th, 2009 at 09:12

Any progress on this?

Karthik SivaramMarch 9th, 2009 at 15:49

Hi Eric,

Yes there has been progress. I have sorted out many issues, both SPAM related and personal and finally have the site nearly back to normal. I shall be updating the extension’s download in the next few hours, with the new features as previously promised.

I am still sorting out my email SPAM, so bear with me till then :-)


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