Hi, I periodically send out mass email updates to approximately 5k members using the Communication tab in the ACP --> Email Users, but most are reporting that the emails go into their spam/junk folders and they therefore do not see them.
Is there a way around this? Thanks!
This indicates that you have a poor sending reputation with most email providers.
I'm guessing you are sending email using your hosting provider's SMTP service? If it's a shared server - you are going to share the same sending reputation as everyone else on the server, and so if someone else is not doing the right thing, you will suffer too.
I highly recommend using a 3rd party Email Service Provider (Sendgrid, SparkPost, AWS SES, etc) - they are much more reliable for sending emails. However, note that some of these do not allow marketing emails (emails sent to multiple users in bulk) and are for transactional email only.
You also need to ensure you have SPF and DKIM set up to identify who you are to mail providers. Using a 3rd party ESP will make this step easy.
Finally - you need to ensure that your mailing list is clean. If you continue to attempt sending to invalid email addresses, then email providers (Google / Yahoo / Microsoft / etc) will consider you to most likely be a spammer and will block your emails or put them in spam.
It is critically important that you set up bounced email handling in XenForo to prevent repeated attempts to email invalid addresses.