Email deliverability and open rate are related to each other. Some of the elements of email deliverability of open rates are:
Bounce rate
A hard bounce occurs when an email is sent to a wrong address and a soft bounce can happen when the message is rejected, etc.
The bounce rate should not be more than 5%.
Sender's email
Avoid third party server for sending emails.
Do not use aliases mailboxes. Example: john.smith@gmail.com and js@gmail.com
Primary mailbox is always the best option to choose.
Prospect's email
Avoid using role-based emails. Example: marketing@info.com
Do not use private emails. Example: john.smith@gmail.com
It's always the best idea to choose corporate email addresses. Example: john.smith@domain.com
Subject line
Keep the characters around 60.
Don't use capital letters and exclamation marks.
Avoid spammy words.
Use short subject lines, Example: 'quick question'
Tell the prospect, what is in it for them.
Time intervals between 1st emails and the 2nd
Send 25 to 100 emails per mailbox.
Use multiple mailboxes.
Country law: GDPR is also a very important part to acknowledge.
If you like this article, you can also check out our blogpost about the same topic.