R code not sending email via task scheduler but otherwise runs fine

I have a R code which after doing a bunch of steps sends out an email in the end. When I run this on RStudio, the entire code runs fine and sends out the email. However, when I run this via Windows Task Scheduler, the code still runs fine (and does what is intended) but does not send out the email. I have tried both RDCOMClient and sendmailR, and the problem persists.

Here is how the task is scheduled.

Program/script: "C:\Program Files\R\R-3.1.3\bin\x64\Rscript.exe" Add arguments: datavalv3.R Start in: C:\BLP\Projects\Project_07

Here is the code part with the email (with RDCOMClient)

library(RDCOMClient)

path_name <- file.path(mainDir, subDir)
subject <- paste0("Data quality checks completed for ", analysis_date)
body <- paste0("Data summary has been compiled for all the farms for ",    analysis_date,". All the data summaries are saved in the folder <", path_name, ">.")

email_fn <- function(recipient) {

  OutApp <- COMCreate("Outlook.Application")
  outMail = OutApp$CreateItem(0)
  outMail[["To"]] = recipient
  outMail[["subject"]] = subject
  outMail[["body"]] = body
  outMail$Send()  

}

email_fn(recipient = "person1@abc.com")

Here is the code part with the email (with sendmailR)

library(sendmailR)  

from <- "person1@abc.com"
to <- c("person2@abc.com","person3@abc.com")
subject <- "Email Subject"
body <- "Email body."                     
mailControl = list(smtpServer = "tucson.websitewelcome.com")

sendmail(from = from, to = to, subject = subject, msg = body, control = mailControl)

Any idea what might be the problem?

This is an update: Figured out the problem. In the task scheduler security options, earlier I had checked "Run whether user is logged on or not". I un-checked this and checked "Run only when user is logged on" - this did the trick and the emails are going through.