"wp jv custom email settings" plugin send spam

If you mean the e-mail you received ended up in the spam folder, then you can change the default “WordPress” sender under the Settings->General option where you can also change the sender e-mail address. If you got the setup correctly and your e-mail provider still puts these e-mails into the spam folder you can add the address to your contact list / white list to avoid that. I hope it helps.

No, My host said: your website send spam, i investigate my plugin and inactive this plugin and my website didn’t send spam anymore.

Hosting providers usually have limits established for the number of outgoing emails per hour or per day. How many users you were trying to send notifications using this plugin? Isn’t it the case that you hit the limit?

I recently got some help from one of the plugin users who sent me over some issues identified by SpamAssassin which could be relevant to the above case as well. I released a new version of the plugin in which I applied some formatting fixes to improve the spam score of the e-mails it sends out ( make it less likely these e-mails end up in spam folder). I hope it will help in your case too. If you have a chance to try it out I would welcome any feedback.