There are some factors that influence in the speed of the e-mails sending, some of them are:

1- The use of many images or attached files in the message; sending the e-mail in EML form; it turns the size of the message very big, disabling a good perfomance in the sending.

2- List with many disable e-mails; Newsletter can loose more time trying to validate and send disable or nonexistent e-mails.

3 - The use of few or many simultaneous connections; you must do test in the amount of simultaneous connections for sending, until you find a correct amount for your computer / connection speed. As larger the size of the message, less connections should be used.

Some tips to send e-mails faster, below:

1- Do some tests changing the amount of simultaneous connections for e-mails sending, to find an amount that brings the better result;

2- The ideal is send the e-mails in TEXT format, because the images size generally stay smaller than in other form, then the sending turns faster. If is not interesting to send the message in text, prefer the sending in HTML instead of EM, because the EML form codifies the image in the body of the message, doing the message’s final size stay very big.

3- Optimize the list to send in mode turbo, clicking in “List Optimization” button. It is advisable to use a block from 5 to 10 e-mails.

Attention: Not always a bigger amount of connections to send e-mails brings a high speed of sending. You must test to send e-mails using several amounts of connections, to see in what amount you are getting the best performance