How to use a retention policy for a specific mailbox? - exchange-server

I am new to scripting and want to learn it even more.
I want to delete emails in a specific mailbox that are older than 30 days. The mailbox contains alot of mails and will receive it every day. I need to clean it up multiple times. Is there somebody who can help me with it? The mailbox is named 'Portal'.
I thought this would work, but how can i modify it for a the specific Portal mailbox?
New-RetentionPolicyTag -Name "Portal" -Type All -MessageClass Email -AgeLimitForRetention 30 -RetentionAction DeleteAndAllowRecovery
I Hope somebody can help me. We use Exchange 2013.

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Slack Reminder (/remind #group #channel "Message") not possible

I wonder if someone can help me. I'd like to find a way to setup a daily reminder that will notify particular group in Slack (not the whole channel). I've been looking on the web, but wasn't able to find anything.
Slack does not allow send reminders to multiple users at the same time
Slack also does not allow to create a reminder (/remind) for the group.
Thank you

creating outlook add-in for for outlook 2018

I am working on a project where I would create an extension in outlook that would allow you to see how many emails you received and sent for a certain email (#edu.com). I also want to be able to see things like time received, if the person responded, and the average emails responded to for that particular email group. Any ideas on how I could accomplish this. From what I have seen so far, it looks like I should use the Outlook Graph API for. Any ideas or how to get started would be really nice!
Search for code examples, select the closest one and clone it.
After that try to change its functionality.

How can I add appointment id/data to the link appended to the body of this appointment in Microsoft Exchange?

Just like in the title. I would like users using Outlook to be able to click a link in the appointment which will redirect them to the site with additional data about this meeting. This link should be available in a few seconds after creating this appointment, best immidiately. The link may contain either id to this meeting in Exchange or date, time and room.
Is it possible by using transport rules? I couldn't find anything relevant.
Second way to achieve it may be a service which will scan appointments and append relevant link, but it should work every few seconds and be fully reliable.
Any other way? I can't see anything in message/appointment headers :/
I would like to support Exchange versions from 2010 up to Online.

Exchange - Removing word "EXTERNAL" from Subject line when replying to an external email

We have Exchange server 2013. I am testing a security method to warn users when external emails are received. This is I am doing by putting "EXTERNAL" text in front of subject-line of incoming emails except if the email-subject already has the text. This is working fine.
Now, what I am trying to do is to remove the text "EXTERNAL" when user will reply to the email. I am having a hard time getting a way to achieve it. Exchange rules, so far I have looked into, does not have anything to remove from subject-line, only to prepend.
How can I do it? My goal is to flag incoming external emails and show it users Outlook client in a way so users would see. I want to use Exchange server built-in functionalities, or from Outlook if the settings can be managed by group-policy and users wont be able to change it.
Thanks and appreciate your help.
I do not know the answer but my search for a way to strip "[External]" and "[EXT]" from the subject line of all incoming emails is what brought me here. It seems IT in so many companies has decided this is a great idea and I just want to share my thoughts that it is a HORRIBLE idea and I wish everyone would stop doing it. You can no longer group all emails by subject line and bring everything together, which is seriously inefficient. There HAS to be a better way to teach your employees to not click on spam/scam links than messing with the existing subject lines. This may be my pet peeve of the century.

MailChimp: Bulk re-send opt-in mailout to all subscribers

A client of mine is planning to move from a WordPress newsletter plugin to MailChimp.
As a result we'd be importing all the subscribers from the old system into MailChimp. However we have a feeling that a lot of those subscribers are either fake, dead emails, or not interested any more.
I was wondering whether there is any way to bulk resend an opt-in, so that all subscribers get a mail asking them to click a link to continue their subscription?
I didn't notice anything obvious when selecting all subscribers in a list on MailChimp
At present, it doesn't seem as if there's any way to batch resend confirmation emails. To accomplish what you're after, you can use other mailchimp tools and external methods to clean your list up.
One way would be to contact your users and have them reconfirm. An example from a mailchimp knowledge base article:
"Hi |FNAME|,
Remember us? You visited our website back on |OPTIN_DATE| and signed up for our email newsletter. Well, we’ve finally gotten around to setting up a nifty email newsletter program, and we want to make sure you still want to hear from us. We hope you do, because every month or so our newsletter will include useful how-tos, tips, and advice (plus special offers like the one below).
If you want to stay on our list, click here to renew your subscription! Of course, we don’t want to clog up your inbox with stuff you don’t want. If you're not interested, you can ignore this and you’ll never hear from us again…"
You can also remove people who haven't clicked on the last N campaigns, remove low-rating users, or use another way to remove people who aren't engaging.
Some helpful links:
http://kb.mailchimp.com/article/how-can-i-remove-someone-from-my-list-who-has-never-opened-a-campaign/
http://kb.mailchimp.com/article/how-can-i-remove-someone-from-my-list-who-has-never-opened-a-campaign/#open
http://kb.mailchimp.com/article/how-can-i-remove-someone-from-my-list-who-has-never-opened-a-campaign/#rating

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