Advanced users can change this string.
Open the dconf-editor application.
Navigate to org.gnome.evolution.mail.
Enter the preferred quotation string as the value for the key composer-message-attribution.
The default string in English is: "On ${AbbrevWeekdayName}, ${Year}-${Month}-${Day} at ${24Hour}:${Minute} ${TimeZone}, ${Sender} wrote:"
The following placeholders are available:
{Sender}
{SenderName}
{SenderEMail}
{AbbrevWeekdayName}
{WeekdayName}
{AbbrevMonthName}
{MonthName}
{Day} (format: 01-31)
{ Day} (format: 1-31)
{24Hour}
{12Hour}
{AmPmUpper}
{AmPmLower}
{DayOfYear} (format: 1-366)
{Month} (format: 01-12)
{Minute}
{Seconds}
{2DigitYear} (e.g. 15 for the year 2015)
{Year}
{TimeZone}
You might need to install the dconf-editor package to perform these steps.
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