I can tell you how I do it. I send my initial welcome letter to the affiliate's e-mail address. If it is not delivered you get a delivery failure notice - then I make a note on their profile that the e-mail does not work. For these team members I then just send team mails through genealogy. Not much else you can do - unless you happen to log in while they are online.
For those affiliates who's e-mails go through without me getting a delivery failure notice I can then assume with relative safety that they are receiving my e-mails. With this group I still send my weekly newsletter through genealogy, but I also have the opportunity to send individual e-mails if I see they are not logging in and I can try to get a reaction from them explaining why they are not logging in. With that said - do not send them a lot of e-mails / spam them. With some you will get a reaction and they will tell you why they are not signing in. If it is a problem you can help them with, do so. But keep in mind that it can be something you can not help them with.
The last group is the easiest - they actually communicate with me via e-mail and I enjoy them a lot. They ask questions, follow advice and they are wonderful to work with.
Hope this helps you. I don't think there is a fail-safe method - but the way I do it works for me.
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I can tell you how I do it. I send my initial welcome letter to the affiliate's e-mail address. If it is not delivered you get a delivery failure notice - then I make a note on their profile that the e-mail does not work. For these team members I then just send team mails through genealogy. Not much else you can do - unless you happen to log in while they are online.
For those affiliates who's e-mails go through without me getting a delivery failure notice I can then assume with relative ...more