This thread made me think:
http://mpsocial.com/t/dont-fall-victim-to-email-inactivity/5732?source_topic_id=8398
What I used to do (and also commented on that thread) is use IFTTT to send emails once a week from my main gmail account to all my other gmail accounts.
@abbecain also suggested on that thread to have an auto-resposnse on gmail, so the account will also send emails.
But after re-thinking it, I think gmail want you to LOGIN to the account (at least once in 9 months), and not just have the account receive emails.
And I think gmail will not count the auto-response as a login, since they can see it’s automated.
So today I thought about better ways to automate this.
But wait… MP can automate stuff really good… So here we go:
The idea is simple: Use MP to send and receive emails from each gmail account I have.
Why is this better than IFTTT?
Because MP will actually login to the accounts (using an app/api).
It did take me some time to get this running, since I never used MP with email accounts, as I never found a real use for that, although @Johnny wrote a good post about it:
http://www.massplanner.com/schedule-updates-web-2-0-blog-properties-via-email/
So I got stuck in 2 steps (steps #3 and #14 below), and I hope this guide helps you to set this up in 5 minutes.
So here’s how to set it up:
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MP --> social profiles --> add profile --> email, add profile
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enter the username and pswd for the gmail account. MP will fill out the other 2 fields (smtp blah blah and a number).
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This is the tricky part - if you press verify, it won’t work.
press it again? won’t work…
It took me some time to figure this out. -
Use a browser (or an embedded browser) to login to that gmail account.
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You will find a mail from gmail with the title “Review blocked sign-in attempt”
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The mail just says that you have a problem. So I went back to step #3 to see if my login or pswd were wrong.
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After a cup of coffee, and doing step #3 several times, I read the fine print in that mail.
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The mail says: Google just blocked someone from signing into your Google Account _____@gmail.com from an app that may put your account at risk.
blah blah blah…
and then it says
You can continue to use this app byallowing access to less secure apps, but this may leave your account vulnerable.
If you press that link (“allowing…”) it takes you to a gmail setting where you can ALLOW it. -
You will get another mail from gmail, with the title “Access for less secure apps has been turned on”. No need to do anything there.
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Now go back to step #3 and press verify, and it will work.
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You will get a mail from MP with the title: “MassPlanner Account Verification”, so now you know it works…
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MP --> social profiles --> select that profile —> select the PAGES tab
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In the “add other page” field, add an email address that you want to send to, and press the ADD OTHER PAGE button.
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If you get an error message (it doesn’t happen all the time) saying that you need to input the other page name too, just drink another coffee. No need to fix any error, it’s all good.
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Now add a new destination list with that email account.
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Now add a new campaign, add a post (“testing blah blah”), and choose the destination list.
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Done.
It’s not what it was intended for but it work nicely for this purpose. So thanks for the detailed guide 
help me to add a Rediffmail to MP? When I try it, MP says: “Invalid credentials”. I am not sure if there is any issue with the SMTP server & port. I have not added somewhere else a information regarding rediffmail, so if it is needed (maybe under the section Socieal profiles --> “Add Profile” --> “Email” --> “Pages” --> “add another page”), maybe you can give me some advice. Thank you very much. 
