Free email sending and SMTP services which let you send emails for free without the need of any credit card. Most of these services are full email marketing services where you can keep your mailing lists stored and send emails in bulk when needed.
Email services gives lot of free emails when they launch and later either reduce the number of free emails or completely stop. Many keep on giving inital plans to customers who sign sign up early so sign up early and you may get lucky.
If any of the information provided here is changed please let me know. It will be of great help.
Sendpulse gives 12,000 mails per month for free. Their is no daily sending limit like most services but they have hourly sending limit of 50 emails per hour. They are full featured email marketing provider where you can save your mailing list upto 2500 subscribers for free, generate email collection forms for your website for free. You can also do a/b testing, build templates with drag and drop interface. There are also some automation features provided for free.
For transactional mails you can use their SMTP service but it needs approval beofre you can use it.
They also provide web push service for free for 10,000 subscribers.
Paid service starts at 7.88 USD per month.
Sendgrid is one of the most trusted email sending service. They are used by big companies like Uber, Spotify, Airbnb, yelp etc.
Sendgrid provide 40,00 email credits for the first month and later 100 emails per day for free.
They provide a lot of additional features and libraries in multiple programming languages which you can use for free. Sendgrid is also a full featured email marketing platform. You can create webforms to collect email on your website, add them to mailing list hosted by sendgrid and you can send emails to this list from sendgrid control panel. You can also do email segmentation, a/b testing and much more. Automation features are also provided for free.
Their paid plan start from 15 USD per month that give 40,000 email credits per month.
Only drawback is you only get 100 emails per day that may not be enough for many users.
Sendinblue gives 300 emails per day that is 9000 emails per month to free accounts. I have personally use their service on one of my website and it is good.
They have lots of additional features that any other email service provide. They provide fully featured email marketing features like mailing list storage, web forms to collect email addresses on websites, drag and drop email designing, a/b testing, mailing list segmentation. They also provide advanced tracking options, click and open reporting and marketing automation workflow.
In addition to email service they also provide fully featured CRM, chat window for websites. You can also create facebook ads from the control panel and retargeting option is also there. They also provide SMS marketing service.
Their paid plan starts from 25 USD that included 40,000 emails per month.