If you admin of facebook group, you can send your message to your group members (by invitation or by facebook mail). You must consider not sending a lot of message, it'll considered as spam, and your members will leave the group
Hi a secure idea is to get an autoresponder, create a page even with aweber is going to be hosting the form (in this way you don't need hosting) once you do that, offer them something for free, some report or some of interest in exchange of their email-address, and make this offer in different forms for some days, in this way you pull from there your users, any other method is risky.
Hi Imraan An autoresponder is a paid software check for example aweber.com or getresponse.com are the most popular. If you put a link in your fanpage where you offer them something valuable many of them are going to see your ad and they are going to signup, once there you can send to all the persons on your list if you have 20,000 or 50,000 you can do it, from that type of autoresponders, if you try using for example an gmail account or something you are going to be banned.
may be you will send them with your note, so you tag your friend what do you want,,, thaks,, wish help you,,
Do you really need to send them message privately, or you can do it publicly? I think your only solution is to create a page on Facebook and ask them to like your page. If done, you can now share with them your message through your page wall - This will be visible on their wall and can read them without you getting banned.
@hozrin could you please tell how to send invite mail all in one facebook group by clicking invite mail option ? thanks in advance
Well I believe the easiest and most effective way to do this is with an Autoresponder. The two most popular are AWebber and GetResponse. I know with GetResponse your first month is free so you can try it and see if you like it without any cash outlay. I think AWebber has a similar offer as well.
As of 2021 I use CUCOMM for bulk message sending on Facebook. It's very simple - just two buttons: Collect Profiles and Send Message and it's integrated in Facebook page. So you click it when it's convenient and it doesn't require your login and password from Facebook. You can send about 80-150 messages per day from every fb profile. I found it in this article, so it has more info about facebook bots blocking limits: https://cucomm.com/blog/facebook-marketing-tool