The Thunderbird client is great. Been using it forever. You still need an IMAP email account somewhere. Some alternative email providers not yet mentioned: 1. Office365 Email (Microsoft is "never" going to go out of business) $48 per year (just email) $150 per year (included in Office 365 Small Business Premium with full Office Suite) -- This is the option I'm using for my mom since she was interested in subscribing to get the office apps anyway 2. MarxMail (great spam filtering, been around forever, but is mom+pop so who knows how long it will last) $30/year - http://www.marxmail.net/ 3. IMAP/SMTP though webhost such as DreamHost (often including hosting, domain registration, and email) for various prices 4. Yahoo Business Email $34/yr. for 1 account - https://smallbusiness.yahoo.com/email Note: I never give/gave out my [at]spamcop.net email address. I use aliases/forwarders on my webhost to hand off the mail to the spamcop.net account instead. I highly recommend this method because it makes it (a bit) easier to switch mailbox providers. I am very sad that the well-integrated [at]spamcop.net mailboxes are going away. I am fairly certain this means I'll stop reporting spam. (Also, I use name-of-store[at]example.com when some company wants my email address, so I can shut off the name-of-store[at].. alias if it starts getting spam). (edit: added 1 more option and some more background info) My Final Decision (final edit to this post, no need to bump thread)
I'm using FastMail's 60-day free trial, and so far it seems I can use it just how I use SpamCop today (minus the built-in Held Mail reporting)
I like the webmail, but I mostly use my phone or Thunderbird
I like that I can use their "Personalities" feature to create multiple "From:" addresses to match any of the mail forwarded from any of my domains
Their SMTP server (just like CES/Spamcop) has no problem if I want to specify an arbitrary "From:" address in Thunderbird
It seems like it can POP external accounts, but I haven't tried yet. If it doesn't, I'll just add them to Thunderbird. It's not as important now since I'm not trying to report spam on my Hotmail/Yahoo/Gmail accounts.
It works well with the iPhone email client and with Thunderbird
It looks like the $20/yr. account is fine for my needs. I remove all mail from the server and keep it in Thunderbird when it's six months old, so 1GB should be fine.
I see no need to spend money to filter/report spam. I need to take a look again at the free SpamCop offerings. It still might be too much of a hassle to report now, even if the increased hassle if very minor.
I've moved a cousin and my wife off to Gmail over the years. That's where my dad's going to. It would be pretty cool if, at this point, spamcop offered a service where it could log in to external IMAP accounts to access a Held or Junk folder for reporting like we used to have. Also, it would be nice if the reporting site was https -- not related to this, but it has always bugged me.
I see no need to bump the thread for this...
Update 2014-11-15: I have been on fastmail.com since the posts above. I use it by forwarding in from my domain hosting company (DreamHost). I then use free spamcop.net reporting by forwarding any spam mail as attachments. I would happily pay for a spamcop.net feature where it would log into 3rd part IMAP servers (preferably the spam folder on the account), so I could report without having to forward. I am happy with fastmail.com's reliability, IMAP&SMTP support, webmail interface (even on mobile, it's great), spam filtering, and price. Only thing that was lame is the 60 day trial got cut short as soon as I paid. So, if you want to save a little money, wait until the very end of the trial to pay for your account.