To cite package ‘sendgridr’ in publications use:

  Park C (2024). _sendgridr: Mail Sender Using 'Sendgrid' Service_. R
  package version 0.6.2, , <https://github.com/mrchypark/sendgridr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {sendgridr: Mail Sender Using 'Sendgrid' Service},
    author = {Chanyub Park},
    year = {2024},
    note = {R package version 0.6.2, 
},
    url = {https://github.com/mrchypark/sendgridr},
  }