People in Scotland between the ages of 70 and 79 are being asked to keep an eye out for blue envelopes containing their coronavirus vaccination appointments.
From Monday, several health boards will begin to send out letters telling those in the age group when they will receive their first dose of the Covid-19 jab.
So far, more than 380,000 people in Scotland have received their first dose of the vaccine.
Health Secretary Jeane Freeman has urged people to look out for the “very distinctive” envelopes, which are being given priority by Royal Mail.
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A new booking system is also being used by several health boards to schedule appointments for patients in order of priority.
Greater Glasgow, Lanarkshire and Lothian are among the NHS boards which will use the system.
The Scottish Government said they are on track for all those aged 80 and over to have received their first dose of the vaccine by the end of the first week in February.
This age group will not receive a blue envelope as they are being contacted by telephone or another form of letter.
Ms Freeman said: “We all know how easy it is to ignore some of the mail which comes through our letterboxes but these blue envelopes will be very distinctive and they will contain details of your vaccine appointment so please open them.
“The letters are being posted first class and we have been advised by the Royal Mail that the colour will allow them to prioritise delivery.
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“The blue envelopes will contain information about the time and place of your appointment and details on how to reschedule it if you are unable to attend.
“I would urge everyone to take up their appointment when they are offered one.
“The vaccination programme is one of three key ways we are working to beat this virus, along with our expanded testing programme to identify cases and break chains of transmission and the important lockdown restrictions everyone in Scotland must follow.
“All these measures work to greatest effect when they work together.”