Aliases are not an option, as each account serves a specific purpose, and monitored by a whole support team, with IMAP sync to various team members.
Simply include a feature where the sync for every account can be finely tuned, and you will be halfway there to accommodating Postbox power users.
The strict separation between the individual mailboxes using profiles is the core feature of Postbox, Thunderbird …
I was very surprised and annoyed when all my profiles and their mailboxes were ‘lumped together’ during the migration from Postbox to eM Cilent 
I used Postbox for many years, but switched to emClient a year ago due to the unresolvable and sometimes extremely high CPU load caused by Postbox. I liked the usability in Postbox better in parts, but emClient offers significantly more functions, runs very stably under Mac OS and, above all, has no problems with CPU and RAM load.
In my opinion, the perfect mail client does not yet exist, but emClient is definitely one of the good ones.
Are you using IMAP accounts? If so, you don’t need to manually export and import them a they will download from the server as needed.
If you are using POP accounts, you should still not need to export each email as an EML file, you should be able to export each account separately, or even all accounts together.
I don’t have 100,000 emails, but my wife has nearly that many unread in her Inbox (I honestly don’t know how she can live with that!) and she has just moved to a new PC without any issues or loss of mail.
More about Postbox ->> Thunderbird you will see here (about the import rules problem too)
import from Postbox | Thunderbird Support Forum | Mozilla Support …
import from Postbox | Thunderbird Support Forum | Mozilla Support
I test both - eM Client and Thunderbird! The better wins!
PS: I have an Postbox and eM Client license!
Not much helpful feedback or constructive criticism in this vitriolic diatribe. Your conclusion-jumping opinions about eM Client’s chances of recouping their investment in no way elaborate on what you find lacking in the app. In fact, they’re irrelevant to the questions at hand.
For me, Postbox has been crippled and bombing multiple times a day for over 2 years, with no updates of significance and a completely unresponsive support team. As for Thunderbird, it’s rife with at least as many shortcomings (conversation threading is the worst I’ve ever seen) — which are unlikely to improve quickly if history is any indication.
Meanwhile, eM Client has already improved significantly since the last time I tried it a year or two ago, and seems to be ramping up for a major effort to not only incorporate Postbox features, but to do so with the active collaboration of the Postbox community.
eM Client definitely has a long way to go, but after downloading it again wake of Postbox folding, I’ve been pleased and relieved to discover it’s the only email app I’ve found since Postbox itself (15+ years ago) that I’ve actually reached for as my daily driver each morning. With other apps, I’ve had to talk myself into using them despite their shortcomings. (A handful do maybe 85% of what I need, but that last 15% always included major dealbreakers.)
eM Client’s current shortcomings may be dealbreakers for you — some of them are verging on dealbreakers for me too — but don’t presume to speak for the majority of Postbox users. Instead of jumping to conclusions, I’m waiting for their first post-Postbox release before assuming anything about the app’s future development.
Feedback was asked, and feedback was given. Nothing vitriolic about it.
Suck it up, and get on with your own issues.
I have clearly stated that eM Client is a very nice email application, but that it does not work well for power users.
It’s my opinion, and like that body part we sit on, everyone has an opinion.
Can’t answer here
From Postbox to eM Client worth it?
That when importing several Postbox profiles they were all merged into one eM porfile - no prior information about this!
and
POP3 accounts that were set to ‘do not delete - leave mails on server’ in Postbox were set to ‘delete mails from server after 7 days’ in eM without asking and without warning!
That was a bad thing that should not happen, need to repair quickly!
Thank you for reporting it. We’ve just fixed the POP3 import issue with do not delete/delete mails from server after 7 days. It’ll be available with the next update. We will also work on profile support, but for now (as eM Client does not support profiles) it was the only way to import all the accounts into the main and only profile in eM Client.
Whatever you paid for Postbox, it’s unlikely you will make it back from Postbox users. They won’t buy into eMClient.
In my opinion, the only way you are going to make your money back, is to keep Postbox alive, and keep milking that cash cow.
This isn’t feedback about the app or it’s usability, nor is helpful or constructive in any way. It’s just throwing shade at the developer, based on unfounded speculation, for no discernible reason.
I definitely get it that eM Client feels like a huge step down for you, and based on the actionable feedback you did provide, that’s fair enough. Maybe it was just your frustration talking, and that’s understandable. I’d prefer Postbox survive as well. But that’s not happening, and it’s been pretty clear for a couple years now that’s not happening. eM Client may not be for you, but dunking on their business choices isn’t useful “feedback.” Just sayin’.
/Postbox power-user since 2009 (v2.0b)
For Postbox users moving across to eM Client who are missing features, eM Client is looking to add those features you had via the following announcement page where you can also vote for those ideas in that thread. Also suggest any other ideas that would be good to have as well.
Click the follow eM Client link below.
New features will then be available for PC & Mac when implemented via the updates on the release history page. So check that regularly as well.
Feedback it is indeed. Just like my mother once told me, that I would never be a ballet dancer, and she was right. Sure, I was hurt, but her honest feedback was of great help, and I ended up all the better for it 
I do sense that the management of eM Client are listening, and I believe we will see the Postbox features appear in eM Client. That would be great.
However, the same result could have been achieved, by simply buying a copy of Postbox at retail, look at the features, and reproduce accordingly.
There was no need to actually buy the company, as it’s not Saas. The Postbox users will simply keep using their installed version, until it completely falls apart. Myself included.
Here is my feedback and opinion, again. Whatever eM Client paid for Postbox, it was too much.
And that, is the only 2 cents I am willing to spend.
Not begruding you your opinions. But pointless criticism of the company’s financial and business decisions — especially when you have literally zero insight into the details of those decisions or what motivated them — are in no way of value to a conversation about the software itself. I’ll drop it because by continuing to engage, I’m exacerbating of the problem of a topic orthogonal to not just this thread, but to whole point of this forum. I hope Postbox continues to sever you well into the future. I have my fair share of long-dead apps I’m clinging to on my devices, so I get it.
I feel like the goal of this transaction was to allow Postbox users a path forward in the future with eM Client, rather then an abrupt end into the abyss. This in itself is a good thing for Postbox users. As announced, Postbox will continue to be supported until December 22nd, 2024, and a discounted option was provided for Postbox users to migrate to eM Client if it fulfills their needs. For users whom needs are not met, they are trying to eventually win them over by listening and trying to implement the most important and requested Postbox features.
I don’t understand all the negativity based on this situation. Nothing is stopping someone from continuing to use Postbox until eM Client meets their needs, or they find an alternative email client that does. I know many users probably hoped Postbox development would continue, but eM Client has decided it is better they implement the important Postbox features directly into eM Client, rather then maintaining a completely different codebase they are unfamiliar with which I am sure would be very expensive and difficult.
So I am happy to see at least eM Client stepped in and gave some future path to Postbox users, rather then it fading away slowly like it has, and then a sudden death to nowhere. So keeping things to constructive feedback and using the Sleedplan page (Help bring the best of Postbox to eM Client) is the best path forward towards an eM Client that eventually wins over most Postbox users. Of course there is always the expectation that it is impossible to make everyone 100% satisfied, but they at least are making a coordinated effort to do so, so better not to degrade or belittle the effort as it is.
Thank you, that was exactly the idea. We’ll do our best to come up with the most important features Postbox users are used to as soon as possible. We will listen and we will prioritize based on your feedback and voting. We just need a better insight from you what really are the most important things. And some features can be implemented pretty easily and quickly, some are a bit different story. We’ll try to be as transparent as possible with our road plan for these improvements.
@Robio You can not separate the business decisions from what the development team will do.
I am sure we have all seen great software disappearing or harmed because of management decisions.
The point @ZaGenie makes here is that if ex- or current postbox users do not convert to EM, then adding features that would satisfy postbox users may slow down or even abandoned. This would leave EM in a position with sunk costs.
I obviously have no idea what kind of company EM is (e.g., revenue, finances, stability, number of employees) but if @ZaGenie is right about the low conversion rate and EM is a medium sized company, then the whole existence of EM may be threatened harming existing users as well.
This is why @ZaGenie’s feedback is 1) feedback indeed and 2) relevant.
As long as feedback is polite (as in this case), it should be welcomed even when it is sharp and not pleasant.
I should also point out that I have some serious issues with emClient and regularly scout the market for new email clients BUT, in all honesty, emClient seems the most complete, modern and stable client out there.
As long as feedback is polite…
I don’t agree that it was, but I guess that’s the internet for ya.
but if @ZaGenie is right about the low conversion rate
…which we have no way of knowing.
I have some serious issues with emClient and regularly scout the market for new email clients BUT, in all honesty, emClient seems the most complete, modern and stable client out there.
Boy, do I hear that. I can’t tell you how many apps I have that are 85% perfect, but that last 15% is so annoying it keeps me constantly on the hunt for something better.
Biggest thing for me – since you’ve nailed tagging – is more and better (preferably one-lette) keyboard shortcuts: for tagging, for navigation, for pop-up menus…
That, and make it more Mac-like: AppleScript, Apple Events, links to messages, tabs, layout touches.
But I’m sold. In some ways it’s better than Postbox already.
We may be able to get a feeling by looking at how EM will deal with requests for postbox features,
In my view, the situation with email clients in the market is the opposite. Most of them meet a threshold line (and some not) but then 85% are annoying for different reasons.
From a business perspective, I think EM made a gamble here with the acquisition of Postbox.
I’ve been using eM Client for about a day on Windows. Here’s my initial list of peeves I wish were better…
But…not a lot of other great options out there on Windows. Outlook’s conversation (thread) view is a hot mess and a non-starter for me. And, at least, eM Client seems to be getting regular updates and the company engages more with its customers than Postbox did, so maybe I can hope some of my complaints might be fixed.