You will receive proof of voluntary consent by using the

[Shishirgano9]

To ensure this, your online forms should have a checkbox with a declaration of consent. In addition, this should be described and listed in the data protection information.

double opt-in procedure - a mechanism in which the employment database consent of the data subject to data processing is obtained twice and thus reliably confirmed .

GDPR and email marketing - Element 5:
Enable data transfer
The GDPR allows the processing of personal data in a machine-readable and structured form, which is done with consent or based on legitimate interest.
The fact that this data is available digitally is an implicit fact, which also enables it to be transferred to others.

This transfer can be helpful for those affected - for example, if they change provider. According to the GDPR, it can be requested from the data provider/contact at any time.
Therefore, make sure that your system is equipped for this possible data export.

GDPR and email marketing - Element 6:
Obtain consent for user profiles as well
Since May 2018, pseudonymization , anonymization, etc. have also been classified as a form of data processing. This means that data sets without real names - collected for market research, for example - are also considered user profiles.
This means that
even pseudonymized user profiles require the consent of those affected.

Since email marketing often involves documenting individual interactions and, as a result, creating a user profile of the recipients, you should ensure that you obtain the consent of those affected in advance.