Free Twitter Tools to Send Automated Direct Messages
In fact, Twitter is an excellent marketing tool. 
You can send direct messages
                                    (DM) to your followers about your blog or new services and it won't be considered
                                    spam, as long as you do it right and only send useful links. 
In addition,
                                    Twitter has removed the 280-character limit from direct messages. This means that
                                    there is no character limit for direct messages. 
Next, we'll share with you
                                    some useful Twitter tools for sending automated direct messages and sending direct
                                    messages in bulk. 
1. CrowdFire 
CrowdFire is a free
                                    website for sending Twitter Auto DMs to new followers. it will let you specify an
                                    automated message that will be sent to your new Twitter followers. After that, it
                                    will automatically send the specified message to your new followers. 
Note
                                    that it will add "via @crowdfire" after each automated DM in the free plan. If you
                                    feel comfortable with this, then you can continue to use it to send automated DMs to
                                    your new followers.
                                     
                                
URL: https://www.crowdfireapp.com/
                                    
2. SocialOopmh 
SocialOopmh is a tool that helps you
                                    be more productive by sending automated direct messages. 
Here are the steps
                                    you need to follow to configure automatic Twitter DMs through SocialOomph. 
After
                                    upgrading your account, go to your SocialOomph dashboard and click Following >
                                    Follow-Back & Auto-Welcome. 
Click "Configure" to configure any profiles you
                                    have connected. 
You can configure the messages that should be sent, and then
                                    this message is automatically sent to the new follower.
                                     
                                
URL: https://www.socialoomph.com/
                                    
3. Tweet Hunter 
Tweet Hunter allows you to send
                                    automatic DMs to anyone who has interacted with your tweets. 
Unlike other
                                    spam options that used to let you send automatic DMs to everyone, this option is
                                    based on interaction. In this feature, you can decide whether to send Auto DMs to
                                    users who have liked, retweeted or commented on your recent tweets. 
Here is
                                    how to use this feature: 
- Login to Tweet Hunter using your Twitter profile
                                    
- Click on write a tweet from the left panel 
- Start writing your
                                    tweet in the right panel, and click on advanced options 
- And here, you can
                                    configure the settings for sending automated DM
                                     
                                
URL: https://tweethunter.io/
                                    
Important things to note before sending a Twitter DM:
                                    
- You can send a private message to anyone who follows you on Twitter.
                                    
- You can reply to anyone who sends you a DM, whether they follow you or
                                    not. 
- There is no character limit on Twitter DMs. 
- Use Twitter DMs
                                    to build connections/relationships, not to try to sell something. 
- Try not
                                    to send the first DM with a link, as it reduces trust.